Hong Kong Crossover: Watching Battles Maxes Out My Skills, but I Refuse to Be an Undercover Cop

After transmigrating into the 1980s, police academy student Shen Yan witnesses Chen Yongren and Zhuo Kai being selected for undercover work and awakens heaven-defying comprehension. A glance at people fighting is enough for him to instantly master mixed martial arts. He stops the two from dropping out and exposes the deadly trap awaiting them undercover. With extraordinary fighting skills and intelligence, he rises through the ranks of elite criminal investigation, eventually becoming the real power behind the O Division instead of a disposable pawn.