Under Cover (2017)

Both dramas portray a cop who goes undercover to break a drug ring.
Both agents get help from other civilians to help them accomplish their task.
Both dramas have seemingly dirty cops who complicate their task.

Both dramas have cops going undercover to break a drug dealing operation.
Both agents have super fighting skills.
Both agents fall in love during their undercover work.
Both agents almost die trying to accomplish their mission.

Both dramas have Lin Yu Shen as the main lead.
He plays a police officer in both drams.
In Undercover he plays an undercover cop who has infiltrated the drug gang.
In Master, Wait a Moment, he plays a cop who mentors a rookie cop.
Lin Yu Shen demonstrates his super fighting skills in both dramas.