Desperate for a reunion, Hwang Geumjoo seemingly finds her long-lost daughter. After discovering the truth, Kang Namsoon prepares for her trip to Korea.

The incident at the Han River puts a spotlight on Namsoon. As Kang Heeshik spends more time with Namsoon, he connects the dots about her family.

After a dramatic reunion, Namsoon becomes closer to her family. As Heeshik continues to investigate a drug case, Namsoon lends her assistance.

As Namsoon assists Heeshik in his drug investigation, she has a run-in with the ominous Ryu Shio. Ri Hwaja plots her revenge against Namsoon.

Heeshik witnesses the jarring effects of the drug when it strikes his team leader. Namsoon's search for evidence garners attention from foes.

Geumjoo pays a strategic visit to Shio, who has his own motives. During a birthday dinner, Namsoon's family questions her growing kinship with Heeshik.

Heeshik begins to worry about Namsoon after Shio promotes her into his inner circle. Geumjoo probes deeper into a suspicious businessman.

Namsoon pulls off a bold heist, putting Shio on high alert. During a tense meeting, Geumjoo challenges Shio — who in return begins plotting his revenge.

Geumjoo falls victim to Shio's attack but proves she's one step ahead of him. As Namsoon finally tracks down the drugs, her brother succumbs to them.

The drug infiltrates Namsoon's family — prompting a search of the source and an antidote. A mourning Heeshik furiously goes after Shio's inner circle.

Shio learns of Geumjoo's ruse and decides to expand his target. As the drug case becomes more intense, Heeshik asks Namsoon to move in with him.

To find out Namsoon's identity, Shio narrows down his search and goes after her family. Heeshik faces harsh discipline after news of the drug goes wide.

Shio vows revenge after discovering the truth about Namsoon. While Heeshik continues his investigation, Namsoon and her family go on a trip to Busan.

Mourning the loss of Hwaja, Namsoon directly challenges Shio. But he refuses to lose, forcing her to endure incredible pain to save her adopted mother.

With Namsoon on the brink of death — Heeshik rushes to find an antidote. Namsoon faces Shio once again but witnesses a surprising turn.