There is a fine line between genius and madness.
Song Zhi was involved in an inheritance dispute and was charged with murdering his biological father. In order to escape jail, he had no choice but to sign a psychiatric diagnosis and was sent to a lunatic asylum.
In the intensive care unit there she met Xixi, a madman who could be called a genius.
As a fake "madman", Song Zhi's wish is to escape from the asylum as soon as possible and find out the truth about his father's murder.
As a true "madman", Xixi's wish is to upgrade Song Zhi's status from a personal pet dog to a personal bed partner as soon as possible.