Gu Nuan and Mu Hanchen are married, but they have doubts about each other. In a conspiracy, Gu Nuan is assassinated by her own sister and spends a night with Mu Hanchen, waking up with their souls swapped. The two are forced to live in each other's identity, from strangers to understanding, from resistance to dependence, this misplaced love affair quietly took root. In the process of searching for the method of exchange, the two people's hearts gradually solve the knot, love secretly.