It turned out Dong-ha was the real culprit.
On the latest episode of the SBS drama "Suspicious Partner", Eun Bong-hee (Nam Ji-hyeon) confessed her feelings to Noh Ji-wook (Ji Chang-wook) but was dumped and Jeong Hyeon-soo (Dong Ha) was the culprit.
Eun Bong-hee told Noh Ji-wook that she liked her but he pushed her away saying, "Don't like me".
Eun Bong-hee said, "Then don't be nice to me or I might misunderstand". In front of the team, she said, "You and I are nothing".
Eun Bong-hee and Noh Ji-wook set out to investigate Jeong Hyeon-soo's alibi. They got footages from the CCTV from the neighborhood where the murder occurred and even Cha Yoo-jeong (Nara) was there too.