 Park Man-soo is an ordinary salaryman who lives his life according to a strict set of rules, and this lack of flexibility makes him hard to like at home and at the office.One day, his wife asks for a divorce because she's bored with their life, and he is fired because his corrupt boss hates him.So on his way home, the frustrated and outraged Man-soo tries to set himself free by breaking all the rules that have restricted him his entire life by deviating from them, just for one day.