Nan Xing, an ex-athlete and web novel writer, makes an accidental wish for her unforgettable love in front of Fairy Zhen's water fountain. Her wish triggers the summoning of the villain inside her novel, Xiao Wudi. Though she feels threatened by the clever and cunning Xiao Wudi, Nan Xing allows him to stay in her spare apartment next door. Xiao Wudi's annoyance at Nan Xing's summoning ability when she wishes for romantic gestures or help leads him to act as Nan Xing's love guru in hopes of returning to his world. Xiao Wudi soon finds himself falling for Nan Xing during their time together. Meanwhile, Nan Xing pushes to get a firm footing in her career and learns to open up her heart again. Mr. Bad is actually a very good drama that is enjoyable to watch with excellent chemistry between the 2 lead actors (Shen Yue and Chen Zhe Yuan).