Black X.

An ordinary worker who wakes up in the wake of an in-fighting mobster whose home, wealth and popularity are linked to the crowd, and who knows who's around, and who knows who, in order to keep his identity, he's in the middle of a murder case with experience in the workplace, and he finds out that he's already involved in a murder case, when he's forced by the old forces into a police investigation, he has to find a way out for himself in front of a disguise.