In the first episode of "Happiness," we are introduced to the main character, a real estate agent named Han Tae-kyung, who is struggling with his life and career. He lives in a high-rise apartment complex that is modern but has a sense of isolation. The episode opens with him attending a meeting where he is pressured to sell more properties. His boss is demanding, and Tae-kyung feels the weight of expectations. He is also dealing with personal issues, including a strained relationship with his girlfriend, who is frustrated with his lack of ambition.

As the story unfolds, we see Tae-kyung's interactions with his neighbors, including a mysterious woman named Seo-yeon, who seems to have a troubled past. She is often seen alone, and there is an air of sadness around her. Tae-kyung is drawn to her, sensing a connection that he cannot quite explain. Meanwhile, the apartment complex is abuzz with rumors of a strange illness that is affecting some residents, causing them to exhibit unusual behavior.

In the following scenes, we witness the first signs of the illness manifesting in the community. A resident named Mr. Park begins to act erratically, leading to a confrontation with his family. This incident creates a ripple effect of fear among the residents, who start to worry about their own safety. Tae-kyung, while initially dismissive of the rumors, begins to feel the tension in the air as more residents show signs of the illness.

As the episode progresses, Tae-kyung's relationship with Seo-yeon deepens. They share moments of vulnerability, and she reveals her struggles with loneliness and her past experiences. This connection becomes a source of comfort for both of them amidst the chaos unfolding in the building. However, Tae-kyung is still torn between his responsibilities at work and his growing feelings for Seo-yeon.

The climax of the episode occurs when the illness escalates, and a resident becomes violent, attacking others in the building. This incident forces the residents to band together, but it also highlights the fractures in their community. Tae-kyung finds himself in a position where he must choose between helping his neighbors or focusing on his own survival. He ultimately decides to assist in calming the situation, showcasing his emerging sense of responsibility.

In the second episode, the aftermath of the violent incident leaves the residents shaken. Tae-kyung and Seo-yeon work together to support those affected, and their bond strengthens as they navigate the challenges of the community. They begin to uncover more about the illness, which seems to be linked to the building itself, raising questions about its origins and the safety of their home.

As they investigate, they encounter a neighbor named Joo-hee, who has been researching the illness. She shares her findings, suggesting that the building may be cursed or harboring some dark secret. This revelation adds a layer of urgency to their quest for answers, as the illness continues to spread. Tae-kyung feels a growing sense of responsibility not just for himself but for the entire community.

Tensions rise when the residents hold a meeting to discuss the situation. Fear and paranoia grip the group, leading to accusations and mistrust. Tae-kyung tries to mediate, but the atmosphere becomes increasingly hostile. Seo-yeon stands by his side, providing emotional support, but she also grapples with her own fears about the illness and its implications for their future.

In the third episode, the illness takes a more sinister turn, with residents exhibiting violent and erratic behavior. Tae-kyung and Seo-yeon decide to take matters into their own hands, seeking out the building's management for answers. They confront the property manager, who is evasive and dismissive, further fueling their suspicions about the building's safety.

As they dig deeper, they discover that several residents have gone missing, heightening the sense of dread. Tae-kyung's determination to protect Seo-yeon and the other residents grows stronger, and he begins to rally a group of neighbors to investigate the building's history. This decision marks a turning point for Tae-kyung, as he embraces a leadership role within the community.

The fourth episode sees the group uncovering disturbing truths about the building's past, including previous incidents of violence and unexplained disappearances. They learn that the building was constructed on land with a dark history, which may be linked to the current outbreak of illness. This revelation deepens the mystery and raises the stakes for the residents, who now feel trapped in a place that may be cursed.

As the group continues their investigation, they face internal conflicts and differing opinions on how to proceed. Some residents want to leave the building, while others are determined to stay and fight against the illness. Tae-kyung finds himself caught in the middle, trying to balance the needs of the group with his own fears for Seo-yeon's safety.

In the fifth episode, the situation escalates as the illness spreads further, leading to more violent incidents within the building. Tae-kyung and Seo-yeon work tirelessly to keep the peace, but their efforts are met with resistance from some residents who are losing hope. The emotional toll of the situation begins to weigh heavily on Tae-kyung, who struggles with feelings of inadequacy and fear for the future.

The climax of this episode occurs when a major confrontation breaks out among the residents, fueled by fear and desperation. Tae-kyung steps in to mediate, but the chaos threatens to spiral out of control. In a moment of clarity, he realizes that they must confront the source of the illness head-on if they are to have any hope of survival.

In the final episode of the season, the residents band together for a final stand against the illness. They devise a plan to confront the building's management and demand answers. The tension is palpable as they prepare for the confrontation, with emotions running high and uncertainty looming over them.

During the confrontation, the residents learn that the management has been aware of the building's dark history and the potential dangers it poses. This revelation ignites a fierce anger among the residents, leading to a dramatic showdown. Tae-kyung takes a stand, advocating for the safety of his neighbors and demanding accountability from the management.

As the episode concludes, the residents begin to take control of their situation, vowing to fight for their home and each other. Tae-kyung and Seo-yeon's relationship deepens as they find strength in their shared resolve. The season ends on a cliffhanger, leaving the fate of the residents uncertain and the mystery of the illness unresolved, setting the stage for potential future conflicts and revelations.

In the ending of "Happiness," season 1, the story culminates in a tense confrontation between the residents of the apartment complex and the threat posed by the mysterious virus. The characters face their fears and make difficult choices, leading to a resolution that leaves some characters changed forever while others face dire consequences.

As the final episodes unfold, the tension escalates within the apartment complex. The residents, who have been grappling with their own personal struggles, must now confront the reality of the virus that has been spreading among them. The atmosphere is thick with paranoia and fear, as trust erodes and relationships are tested.

In a pivotal scene, the main character, Han Tae-seok, who has been trying to protect the residents, finds himself at odds with the increasingly desperate actions of his neighbors. The emotional weight of his responsibility bears down on him, and he is torn between his desire to save everyone and the harsh reality of the situation. His internal conflict is palpable as he navigates the moral dilemmas presented by the outbreak.

Meanwhile, the character of Seo Yi-seo, who has been struggling with her own demons, faces a moment of reckoning. She must confront her past choices and the impact they have had on her relationships. Her journey culminates in a powerful scene where she chooses to stand up for her neighbors, showcasing her growth and resilience.

As the climax approaches, the residents band together in a desperate attempt to find a solution to the virus. The tension reaches a breaking point when a confrontation occurs, leading to a tragic outcome for some characters. The emotional stakes are high, and the fear of the unknown looms large as they grapple with the consequences of their actions.

In the final moments, the surviving characters are left to pick up the pieces of their shattered lives. The fate of each character is revealed: Han Tae-seok emerges as a reluctant leader, forever changed by the experience; Seo Yi-seo finds a sense of purpose in her newfound strength; and other residents face the harsh reality of loss and survival.

The season concludes with a haunting sense of ambiguity, leaving viewers to ponder the fragility of human connections and the lengths people will go to in the face of fear and uncertainty. The characters are left to navigate their new realities, forever marked by the events that transpired within the walls of their apartment complex.

In the show "Happiness," season 1, there is no post-credit scene. The series concludes its narrative without any additional scenes after the credits roll. The final moments of the last episode focus on the resolution of the main characters' arcs and the overarching themes of the series, leaving viewers with a sense of closure regarding the storylines presented throughout the season. The emphasis is on the emotional and psychological impacts of the events that transpired, rather than teasing future developments or additional content.

The virus in 'Happiness' serves as a catalyst for the unfolding drama and societal breakdown. It transforms people into bloodthirsty creatures, reflecting the darker aspects of human nature and the fragility of civilization. The characters' responses to the virus reveal their true selves, as they navigate fear, survival, and moral dilemmas.

Yoon Sae-bom and Jung Yi-hyun's relationship begins as a professional connection, with both characters working in law enforcement. As the virus outbreak escalates, their bond deepens through shared experiences of fear and survival. They face external threats and personal challenges, leading to moments of vulnerability and trust that strengthen their emotional connection.

Seo Yoon-ji is a pivotal character who embodies the moral complexities of the situation. As a neighbor and friend to Sae-bom and Yi-hyun, her actions and decisions often reflect the struggle between self-preservation and altruism. Her character arc highlights the impact of the virus on personal relationships and the choices people make when faced with life-and-death scenarios.

The residents of the apartment complex exhibit a range of reactions to the outbreak, from panic and paranoia to denial and aggression. As the situation escalates, their initial sense of community begins to fracture, revealing underlying tensions and fears. This dynamic creates a microcosm of society, showcasing how people can turn against each other when survival is at stake.

The backstories of key characters, such as their past traumas and personal struggles, significantly influence their actions during the crisis. For instance, characters with unresolved issues may react more impulsively or selfishly, while others may rise to the occasion, driven by a desire to protect loved ones. These backstories add depth to their motivations and highlight the psychological impact of the outbreak.

"Happiness," season 1, produced in 2021, contains several themes and scenes that may not be suitable for children or sensitive viewers. Here are some potentially objectionable or upsetting aspects:

1. Violence and Horror Elements: The show includes scenes of violence and horror, particularly related to the spread of a mysterious infection that leads to aggressive behavior. This can be unsettling for younger audiences.

2. Psychological Tension: There are moments of intense psychological drama that explore fear, paranoia, and the breakdown of social order, which may be distressing for some viewers.

3. Themes of Isolation and Despair: Characters experience significant emotional turmoil, including feelings of isolation, despair, and hopelessness, which could be heavy for sensitive viewers.

4. Mature Relationships: The show explores complex adult relationships, including themes of betrayal and infidelity, which may not be appropriate for younger viewers.

5. Death and Loss: The narrative includes elements of death and the impact of loss on characters, which can be emotionally challenging.

These aspects contribute to a darker tone that may not be suitable for all audiences, particularly children.