The innocent and kind-hearted trainee angel Nayuan was demoted to the lower world because she accidentally broke the beloved crystal ball of R Angel. Under the arrangement of the angel mother, she entered the Seongde Boys Academy as a boy, where she met the evil boy Ouyang Xichen and the knight Jin. Zeyou and the three became close friends, but as they got along gradually, they actually fell in love with their enemy Ouyang Xichen, but Jin Zeyou was blind to her feelings. Seeing that the date of returning to heaven was approaching, where should Nayuan go...