Park Changho is a layer. He doesn't have a lot of chances of winning cases though, only 10%. One day, a really famous layer, Choi Doha, hires him to do some dangerous work. While doing all this, Changho gets involved in some really dangerous stuff, like being accused for drug use and later going to prison. While in prison, he pretends to be Big Mouse, which is the biggest mafia in the world, so he gets treated like a king. I, his wife, start working at his prison as a doctor and help him.