Liu Changan was given the wrong child when he was young. After returning to the Liu family, his sisters preferred Liu Changsheng, the fake young master who took away his life, and even sent him to a mental hospital for "bullying" Liu Changsheng. After being tortured in the hospital, he was prompted by Chen Yu to pretend to be crazy and was discharged from the hospital to take revenge. He worked step by step to fight back against the bullying of Liu Changsheng and the housekeeper, and used his "mental illness" identity to reveal everyone's true face. The sisters gradually realized the absurdity of their past preference, while Liu Changan sought repayment for all humiliations from Liu Changsheng on the way to completing his revenge plan.
