What is the plot?

Gang Nam-soon is separated from her family as a child in Mongolia, and during that time she discovers that she has superhuman strength. As an adult, she travels to South Korea to find her birth parents, which brings her to Gangnam and into the lives of her mother Hwang Geum-joo and her grandmother Gil Joong-gan.

After Nam-soon reaches Seoul, she finally meets Geum-joo, who is wealthy, energetic, and still obsessed with living a righteous life and doing good deeds after years of searching for her lost daughter. Nam-soon also meets Joong-gan, and the three women begin living in each other's orbit as a family after years of separation.

At the same time, Detective Gang Hee-sik begins investigating a drug case connected to the company Doogo, which is run by Ryu Shi-oh. Nam-soon, Geum-joo, and Joong-gan become entangled in that investigation, and their personal reunion quickly turns into a confrontation with the criminal network behind the drugs.

As the case develops, Hee-sik works with the three women while continuing to pursue the people tied to Doogo. Nam-soon is drawn to Hee-sik during this process, and their relationship grows alongside the investigation.

The story follows the women as they confront the drug operation and its chain of responsibility, with Nam-soon's strength becoming central to the fights, rescues, and clashes that push the investigation forward. The series ends with the criminal case having brought Nam-soon's family together and forced them to face the danger surrounding Doogo and Ryu Shi-oh.

What is the ending?

Nam-soon, her mother Geum-joo, and her grandmother Joong-gan work with Detective Hee-sik to stop the drug ring run through Doogo and its leader Ryu Shi-oh. In the end, the family survives, the drug operation is brought down, and Nam-soon's path circles back toward her birth family and her life in Korea.

First, the story moves into its final confrontation after the investigation into the drug network tightens around Doogo and Shi-oh. Nam-soon has already been pulled between her new life in Korea, her work inside the criminal operation, and her growing bond with Hee-sik, while Geum-joo and Joong-gan use their own strength and connections to help the police.

As the endgame begins, the three generations of women stand on the same side against the people behind the drugs. Nam-soon is no longer only the missing girl from Mongolia; she has returned to Korea, reunited with her birth family, and is fighting beside them. Hee-sik remains with them as the detective tied to the case, and his role stays focused on bringing the operation down.

The final conflict centers on stopping the drug from spreading further and shutting down the people moving it. The pressure rises because people close to the main characters are harmed by the drug during the story, and the ending resolves that threat by exposing and defeating the criminal network. Shi-oh, who has been positioned as the main antagonist and the force behind Doogo, is defeated as the operation collapses.

By the end, the main family is still together. Nam-soon ends her story back with her birth parents and grandmother in Korea. Geum-joo and Joong-gan remain standing after the fight, and Hee-sik's case is resolved through their cooperation. The ending leaves the characters having survived the crisis that brought them together and having succeeded in stopping the drug ring that threatened their lives.

Scene by scene, the closing movement is this: the investigation closes in, the women and Hee-sik press forward, the criminal organization is cornered, Shi-oh loses control of the operation, and the family emerges from the conflict still alive and reunited.

Is there a post-credit scene?

Yes. Strong Girl Nam-soon has a mid-credits/post-credits-style scene after the main ending.

In that scene, Geum-ju visits her cousin Yu-hui at a restaurant and asks why the place has not been expanded or improved with the money she previously sent. Yu-hui explains that the money was spent cleaning up the trouble caused by Chung-dong, and Geum-ju asks Yu-hui to send Chung-dong with her on a mission.

Yu-hui is pleased, believing her son will finally become responsible, and she shouts for him. Her voice reaches Chung-dong at an internet cafe, where he is gaming; he loses focus, punches the computer in frustration, and causes the cafe's electricity to go out, implying that his super strength will matter in the next conflict.

The scene functions as a tease for future action involving Chung-dong and the continuing threat from Nozh/Song Bread and Pavel.

How does Nam-soon lose her family and end up in Mongolia as a child?

Gang Nam-soon disappears as a child and is later shown to have grown up in Mongolia after being separated from her birth family. The story begins from that loss, with her eventual return to Korea driving the central family reunion plot.

How does Nam-soon discover her superhuman strength, and what does she do with it when she returns to Korea?

Nam-soon already has superhuman strength by the time she is identified in the series premise, and after coming to Korea she uses it in practical ways while searching for her parents and getting pulled into police and drug-case trouble.

Who are Nam-soon’s birth mother and grandmother, and what are their roles in the story?

Nam-soon's mother is Hwang Geum-joo, a wealthy Gangnam businesswoman, and her grandmother is Gil Joong-gan. Both are part of the women-centered family line tied to the inherited strength, and they become directly involved in the drug investigation alongside Nam-soon.

Who is Detective Kang Hee-sik, and how is he connected to Nam-soon?

Kang Hee-sik is the detective investigating the drug case that entangles Nam-soon and her family. He works with Nam-soon, her mother, and her grandmother, and the story also notes that Nam-soon becomes attracted to him.

Who is Ryu Shi-oh, and why is he important to Nam-soon’s story?

Ryu Shi-oh is the figure running the drug operation through the company Doogo. He is central to the criminal side of the story because Nam-soon, her mother, her grandmother, and Detective Kang Hee-sik all become involved in the case against him.

Is this family friendly?

Not fully family-friendly for young children. It is a fantasy-comedy with a light, playful tone in places, but it also centers on a drug case, criminal activity, and moments of violence/action, so it may be better suited to older teens and adults.

Potentially objectionable or upsetting elements include: - Crime and drug-related content: the story involves an investigation into a drug case. - Violence and physical danger: the main character has superhuman strength, and the plot involves criminal conflict that can include fights or threatening situations. - Tense or suspenseful scenes: the premise includes being "entangled" in a criminal case, which suggests danger, stress, and possible confrontations. - Adult themes: the series includes romance and a criminal storyline, which may not be ideal for younger children.

If you want, I can also give you a more specific parent-guide style rating for age groups like 7+, 10+, 13+, or 16+.