Reset Life of Regression Police is a Manga/Manhwa/Manhua in (English/Raw) language, manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The story of Choi Jong-hyuk, the head of the crime investigation intelligence team, when he wanted to find his mother's body, he had a mysterious accident then somehow he returned to 1997.