Sung Jun finds out Eun Ki's mother had worked as a nurse at Hope Welfare Center. To further investigate, Sung Jun goes to meet her. When he finds her, Eun Ki's mother shakes nervously. That night, Sung Jun senses that Eun Ki could be in danger and races to the children's center to see her. Will something happen to Eun Ki?

Sung Jun tracks down Sung Hoon to save Eun Ki, but his suspicions are wrong. However, Sung Hoon's story doesn't add up, and Sung Jun still feels like Sung Hoon is hiding something. While tailing his brother, the man in black suddenly appears before him.

Eight people, including Eun Ki, suddenly disappear. Could the culprit they've been after all this time be responsible for gathering the eight people in one location? Or could it be a different culprit? Will Sung Jun be able to save the eight people's lives?

The eight people held captive and on the brink of death make it out alive. Sung Jun arrests Jung In Seong and takes him into custody. However, he needs more evidence to connect him to the other serial murders. He looks to Sung Hoon for help and manages to get a lead. Meanwhile, Eun Ki proposes exposing the truth about Hope Welfare Center to Sung Hoon.

It turns out Sung Hoon and Sung Jun’s parents are taking a big part in the secret behind Hope Welfare Center. Despite the sorrow, Sung Jun must arrest both of his own parents. After their arrest, Sung Hoon also gets arrested for the murders. Regardless of the judgment that he will get, he is relieved to fulfill his lifelong revenge.