I'll Tell You Everything I Know... Let's Meet.

A man who claims to be Song Min-a's dad appears before Ha-bin and demands to know about her relationship with Choi Young-min. Ha-bin learns from him that Tae-soo helped Young-min escape from the police. The police raid Young-min's place and take all the kids for questioning. Ha-bin finds where Young-min is and hears who killed Lee Soo-hyun and why.