For the sake of the gang, she deliberately went to school to work as an undercover student, but unexpectedly she fell into the hands of her class teacher. She was like the person he once loved deeply but could not love. She didn't want to be a substitute for what he loved in his heart. Both of them have gone through grief. What kind of romantic and funny love story will happen to them? Fate has been destined by God a long time ago, isn't it?