A young girl, Nan Xing, who loves to write, accidentally summons the villain Xiao Wud from the novel she wrote when she makes a wish. The clever and cunning Xiao Wudi, who just came to this world, threatened Nan Xing to allow him to stay in the apartment next to hers. They then start on their love-hate relationship and daily lives that one would never find mundane.
After her fiancé unexpectedly calls off their wedding, Lin Beixing is transported back to her high school years through a mysterious glitch on her old phone. There, she reconnects with Zhang Wansen, a brilliant classmate doomed to a tragic fate. Realizing she can alter the past by deleting old messages, Lin sets out to change both their destinies—and discovers a second chance at love and self-discovery.