A dead body turns up in a field of reeds. They find the suspect of the murder, but Tae Joo doesn't think that their suspect is the killer. Dong Cheol disagrees and is certain that the person they caught is the murderer. Meanwhile, Tae Joo begins to remember parts of his past that he had forgotten about.

A woman reports a break-in, but as it turns out, nothing was stolen from her. Meanwhile, the gang at Seobu Police Station finds out about a similar case. They find out the one thing the two victims had in common and track down the victim.

Tae Joo meets his father, who passed away when he was young. Before he can recall the warm memories with his father, another murder occurs. In the midst of solving this crime, he is reminded of how important a father is in a child's life. The closer they get to solving the case, the clearer his memories become. The missing puzzles of his lost memories come together.