Twin sisters from the Jin family were engaged from childhood to the two brothers of the Fu family. The older sister, Jin Huohuo, refuses to accept the marriage and runs away. Fortunately, the Fu brothers have not yet returned from their business trip, so the younger sister, Jin Shuishui, is forced to play both roles alone: by day, she acts as the aloof wife of the Fu family's eldest son, and by night, she becomes the sweet and adorable wife of the second son. She originally planned to wait peacefully for her sister to return, but unexpectedly, Fu Rongyu and Fu Changge come home early. To avoid being exposed, her sister rushes back to help, and a series of twists leads to an accidental switch of identities. Which direction will the story take?