Doubt

Tae-su's tenacity makes him South Korea's top profiler. But his work gets in the way of being a parent, especially when his daughter is a suspect.

Tae-su wants to trust his daughter, but all evidence points to Ha-bin. He draws suspicion from Officer Dae-hong, who begins investigating the case.

New revelations emerge as Tae-su investigates Ha-bin's alibi, while Eo-jin begins to question Tae-su's involvement in the case.

After Tae-su submits a keychain as evidence, the police discover a link to another case. Yeong-min is brought in for questioning once more.

Tae-su receives a shocking call as secrets begin to tumble out. Agitation and suspicion over the unfolding investigation begin to mount.

While Dae-hong is disappointed with the changes in Tae-su, Eo-jin learns about her colleague’s past. Ha-bin reaches a breaking point with Yeong-min.

Another murder forces Tae-su to question his daughter as the evidence points to her involvement. Jun-tae turns himself in.

A mysterious envelope arrives at the station. Ha-bin learns her mother's secret, while Eo-jin's suspicions grow.

Tae-su helplessly watches as the homicide team homes in on Ha-bin as their suspect — and faces a shocking reality when her belongings are confiscated.

The killer is revealed, but the motive is unclear. Ha-bin's fixation on the case continues while Tae-su's guilt consumes him.