The main subject of both dramas is the same. An Unicorn is a term that a privately held STARTUP company. Maybe that stories of both kdramas are not similar the subject is the same people who creates little business and they want to achieve a dream. They main goal is to success with their companies. (Psdt: I’m going to improve my comment)

The protagonist in Crime Puzzle confessed that he killed some people and he did it intentionally because he is trying to find someone in prison and he has girlfriend who doesn’t believe he killed them so she tries to find the truth behind all of this. The same in Bigmouth the protagonist is innocent but he is prison and his wife is trying to find why he was accused.