Love and Lost (2020)

Yan Jin, a businessman and former anti-narcotics policeman, decides to investigate a drug-trafficking case that caused the death of his close friend. He infiltrates into the organization as an undercover cop, and gets to know Ji Xiao Ou. This causes Zhan Yu, who has a one-sided crush on her, to be jealous. However, Zhan Yu was murdered and Yan Jin becomes primary suspect.