In Episode 4 of Doctor Prisoner, the episode opens with the aftermath of the previous events, where the tension between the characters is palpable. Doctor Ji Sung-joon is seen grappling with the consequences of his actions as he navigates the complex dynamics within the prison and the hospital. He is determined to uncover the truth behind the mysterious incidents occurring around him, particularly the suspicious activities involving the hospital staff and the inmates.

As the episode progresses, Ji Sung-joon receives a visit from a former colleague, who provides him with crucial information about the corruption within the hospital. This colleague reveals that there are illegal activities being conducted, including the manipulation of patient records and the exploitation of inmates for medical experiments. Ji Sung-joon's resolve strengthens as he realizes the extent of the corruption and the danger it poses to both the inmates and the hospital staff.

Meanwhile, the character of Han So-geum, a nurse at the hospital, becomes increasingly involved in Ji Sung-joon's investigation. She is portrayed as conflicted, torn between her loyalty to her colleagues and her growing concern for the well-being of the patients. Her internal struggle is highlighted as she witnesses the unethical practices firsthand. In a pivotal moment, she decides to secretly assist Ji Sung-joon, providing him with access to restricted areas of the hospital and sharing information about the staff involved in the corruption.

The plot thickens when Ji Sung-joon discovers that one of the inmates, who has been a victim of the hospital's malpractice, is in critical condition. This inmate, who has been subjected to experimental treatments, becomes a focal point for Ji Sung-joon's efforts to expose the truth. He confronts the head of the hospital, Dr. Lee, demanding answers about the inmate's treatment and the overall practices within the facility. Dr. Lee, however, remains evasive and defensive, further fueling Ji Sung-joon's determination to bring the truth to light.

As tensions rise, Ji Sung-joon devises a plan to gather evidence against the corrupt staff. He enlists the help of Han So-geum, and together they set up a covert operation to document the illegal activities. They use hidden cameras and audio recording devices to capture incriminating evidence. The stakes are high, and both characters are acutely aware of the risks involved, but their commitment to justice drives them forward.

In a climactic sequence, Ji Sung-joon and Han So-geum manage to infiltrate a restricted area of the hospital where the illegal experiments are taking place. They witness firsthand the inhumane treatment of the inmates and the lengths to which the staff will go to cover up their actions. The tension escalates as they narrowly avoid being discovered by security personnel. Their heart-pounding escape from the facility is filled with close calls and adrenaline-fueled moments, showcasing their resourcefulness and determination.

The episode concludes with Ji Sung-joon and Han So-geum successfully obtaining the evidence they need to expose the corruption. They share a moment of relief and camaraderie, but the looming threat of retaliation from the hospital staff hangs over them. Ji Sung-joon's resolve to fight against the injustices within the system is stronger than ever, setting the stage for the conflicts and challenges that lie ahead in the series.

In the ending of "Doctor Prisoner," Season 1, Episode 4, tensions escalate as the main characters confront their personal and professional conflicts. The episode culminates in a dramatic confrontation that reveals hidden motives and the lengths to which characters will go to protect their interests. The episode concludes with unresolved tensions, setting the stage for future conflicts.

As the episode unfolds, we see the aftermath of the previous events weighing heavily on the characters. The scene opens in the hospital, where Doctor Na Yi-je, played by Namgoong Min, is grappling with the consequences of his actions. He is determined to uncover the truth behind the mysterious incidents surrounding the patients and the hospital's administration. His internal struggle is palpable; he feels the weight of responsibility for his patients and the ethical dilemmas he faces.

In a parallel storyline, we witness the character of Jin Se-yeon, portrayed by Kim Byung-chul, who is dealing with her own set of challenges. She is torn between her loyalty to the hospital and her growing suspicions about the corrupt practices that are being hidden from the public. Her emotional state is fraught with anxiety as she tries to navigate the murky waters of hospital politics.

The tension escalates when Doctor Na confronts the hospital's administration about the unethical practices he has uncovered. The confrontation is charged with emotion, as he passionately argues for the patients' rights and the need for transparency. The administrators, however, are dismissive, revealing their own motivations and the lengths they will go to maintain their power. This scene is pivotal, showcasing the clash between integrity and corruption.

As the episode progresses, we see a series of flashbacks that provide insight into the characters' motivations. Doctor Na's past experiences as a prisoner and his desire for justice become clearer, driving his actions in the present. Meanwhile, Jin Se-yeon's backstory reveals her struggles with her own moral compass, adding depth to her character.

The climax of the episode occurs when a critical patient's condition deteriorates due to the negligence of the hospital staff. Doctor Na rushes to intervene, showcasing his dedication and skill as a physician. The emotional stakes are high as he fights against the clock to save the patient, illustrating his commitment to his profession and the lives he is responsible for.

In the final scenes, the fallout from the confrontation with the administration becomes evident. Doctor Na faces repercussions for his actions, and Jin Se-yeon is left to grapple with her own choices. The episode ends on a cliffhanger, with unresolved tensions between the characters, hinting at the conflicts that will continue to unfold in future episodes.

In summary, the fates of the main characters are left uncertain. Doctor Na is poised to face the consequences of his defiance against the corrupt system, while Jin Se-yeon must confront her own loyalties and the moral dilemmas that lie ahead. The episode closes with a sense of foreboding, emphasizing the ongoing struggle between personal integrity and systemic corruption.

In "Doctor Prisoner," Season 1, Episode 4, there is no post-credit scene. The episode concludes without any additional scenes or content after the credits roll. The focus remains on the unfolding drama and character developments throughout the episode, leaving viewers with the tension and intrigue established in the main storyline.

In Episode 4, Na Yi Je's relationship with the inmates deepens as he navigates the complexities of their lives. He shows empathy and understanding, which allows him to gain their trust. This connection is crucial as it highlights his role as a healer, not just physically but emotionally, as he helps them confront their pasts and traumas.

In Episode 4, Lee Jae Hwan's character is portrayed as increasingly conflicted. He grapples with his loyalty to the prison system and his growing awareness of the injustices faced by the inmates. His internal struggle is evident as he witnesses Na Yi Je's compassionate approach, which challenges his own beliefs about authority and justice.

During the medical examination scene in Episode 4, a critical moment arises when Na Yi Je discovers a serious health issue affecting one of the inmates. This revelation not only heightens the tension within the prison but also serves as a catalyst for Na Yi Je to confront the systemic neglect of inmate health, showcasing his commitment to their well-being.

In Episode 4, Kim Byung Soo's quest for revenge becomes a focal point as he plots against those he believes wronged him. His emotional turmoil is palpable, as he oscillates between anger and despair. This internal conflict drives him to make choices that put him at odds with Na Yi Je, further complicating their relationship.

The prison environment in Episode 4 serves as a pressure cooker for the characters, influencing their decisions and interactions. The oppressive atmosphere amplifies feelings of desperation and fear, pushing characters like Na Yi Je and Lee Jae Hwan to make morally ambiguous choices. The setting becomes a character in itself, reflecting the struggles and conflicts faced by the inmates and staff.

"Doctor Prisoner," particularly in Episode 4, contains several elements that may not be suitable for children or sensitive viewers. Here are some potentially objectionable aspects:

1. Violence: The episode includes scenes of physical confrontations and threats, which may be intense and unsettling for younger audiences.

2. Medical Procedures: There are depictions of medical situations that could be graphic or distressing, particularly for those sensitive to health-related themes.

3. Emotional Turmoil: Characters experience significant emotional distress, including themes of betrayal, revenge, and moral dilemmas, which may be heavy for younger viewers to process.

4. Dark Themes: The narrative explores themes of manipulation, power struggles, and ethical conflicts, which may be complex and unsettling for children.

5. Intense Situations: The tension in various scenes can create a sense of anxiety, as characters face life-threatening situations or moral quandaries.

These elements contribute to a darker tone that may not be appropriate for all audiences, particularly children or those who are sensitive to such themes.