[Spoiler] "Suspicious Partner" Why did Dong Ha become a serial killer?

Dong Ha's secret is out.

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On the latest episode of the SBS drama "Suspicious Partner", Hyeon-soo (Dong Ha) took out his secret.

Hyeon-soo made up an alibi after stabbing Bang Gye-jang (Jang Hyuk-jin) and went to find Ji-wook (Ji Chang-wook) himself. Hyeon-soo asked Ji-wook if he could understand his precious ones getting hurt. However, Ji-wook didn't agree and they got into a physical brawl.

Hyeon-soo was taken away by the police but was released soon after. Later, Hyeon-soo went to his school and listened to his music. A girl in uniform was looking at him but when he smiled at her, she disappeared. He was sad.

All the killings that he's done look like they have something to do with the girl in uniform.