Reborn (2020)

Qin Chi is a Deputy Chief Police Officer who awakens from a coma with amnesia only to learn that he apparently led a team of his close friends on a stake-out that ended up with everyone dead. With police suspecting he was a traitor as the sole survivor and all the witnesses dead, Qin Chi must figure out what happened and what his role in the events was. Meanwhile, he’s still adetective and has to solve the various other mysteries behind various complicated cases alongside his colleagues.
(Source: The Suitcase Detective at MyDramaList)