Rend Night Regain Light Episode 4

It tells the story of a criminal police officer investigating a series of revenge cases triggered by a car accident, who discovers that the son of his deceased mentor is involved, and ultimately uncovers a revenge conspiracy that spans many years.Detectives Yan Mi and Sun Xun delve deeper into the case with their rich experience in investigation, revealing a revenge plan that spans several years. During the pursuit of the murderer, Yan Mi unexpectedly discovers that Zhou Guan Nan, the son of his deceased mentor, whom he has always regarded as family, is also involved.(Source: Chinese = Baidu || Translation = MyDramaList)