The Ghost Detective

Da-il and Sang-seob run a detective agency that is on the verge of going out of business; one day, a client comes to them, asking to find a missing child; the more Da-il digs, the stranger the case becomes.

Da-il suspects the academy teacher of taking three kids; while working the case, an aspiring detective visits; Da-il meets a tragic end.

Yeo-wool finds it strange that Da-il vanished from the crime scene, leaving the kids; police investigating also find the case odd; Yeo-wool continues searching for Da-il, worried something happened to him.

Da-il visits Yeo-wool's house, questioning her knowledge; from her story, he learns about the mysterious woman he saw; they begin searching for clues.

Yi-rang's former restaurant manager jumps off a building after an ominous statement; Da-il sympathizes with Yeo-wool, understanding her feelings; the woman in red approaches them.

Da-il suspects Yi-rang's hearing aid may provide clues about the woman in red, so he and Yeo-wool pursue this lead; the woman's next target is the preschool principal.