Doubt

Tae Soo realizes that Ha Bin could be involved in a murder case and starts doubting her.

Tae Soo tries to believe Ha Bin, but he keeps finding evidence connecting her to the investigation.

Tae Soo's colleagues find out that his daughter is involved in the case. Tae Soo finds another crucial piece of evidence.

A keyring hints at a serial murder case, and police revisit Tae Soo as hidden secrets unfold.

Tae Soo discovers Ji Soo's chilling secret and tracks down Choi Young Min to learn more about what he knows.

Ha Bin meets a man who claims to be Song Min Ah's dad. Young Min tells Ha Bin who killed Lee Soo Hyun.

Tae Soo tries to safeguard Ha Bin, but evidence and witnesses make it difficult for him to believe her.

Park Joon Tae confesses that he killed Song Min Ah. However, the evidence suggests otherwise.

Ha Bin becomes the prime suspect in Choi Young Min's murder, and Tae Soo runs out of options.

Tae Soo and Ha Bin find out what actually happened to Ji Soo and figure out the real culprit behind the murders.