A young girl, Nan Xing, who loves to write, accidentally summons the villain Xiao Wudi from the novel she wrote when she makes a wish.
Nan Xing accidentally summons Xiao Wudi, the villain from her novel. Cunning and perceptive, he quickly learns he’s in a different era and absorbs knowledge of modern history, technology, and society.
Xiao Wudi becomes convinced his arrival is linked to Nan Xing. To uncover the connection, he steps in to help her out of trouble.
After defeating robbers, Xiao Wudi improves Nan Xing’s impression of him. To thank him, she lets him stay in Room 302 across from her apartment.
After repeated summons, Xiao Wudi deduces he must stay bound to Nan Xing and fulfill her unreliable wishes. He also charms her mother, Anina, even enjoying her terrible cooking.
Nan Xing summons Xiao Wudi to help save Lu Zichen after he faints from hypoglycemia. Her concern makes Xiao Wudi mistakenly believe she likes Lu Zichen.
Nan Xing admits she never liked Xiao Wudi. Hurt and prideful, he plans to prove she’s lying about her feelings.
Though reluctant, Lu Zichen officially hires Nan Xing. She celebrates by showing Xiao Wudi modern life, but he schemes to trap her and Lu Zichen in an elevator.
Nan Xing is furious over Xiao Wudi’s manipulation, and they part on bad terms. Xiao Wudi begins to suspect he has feelings for her.
Nan Xing gets drunk and falls asleep at Xiao Wudi’s place. He carries her back and stays by her side overnight, finally realizing his love for her.
During an escape room outing, their bond deepens. Busy preparing a submission for a writing contest, Nan Xing neglects Xiao Wudi, who repeatedly forces her to spend time with him.
Xiao Wudi pretends to be sick to gain Nan Xing’s care and even sabotages her home’s electricity to create chances to be alone with her.
Lacking romantic experience, Nan Xing rewrites her story into My Demon Neighbor. Xiao Wudi finds the manuscript and alters it into My Hero Master based on his preferences.
Nan Xing feels uneasy about Xiao Wudi’s sudden gentleness and struggles with writing. They go to the gym and help Xiong Sisi recover unpaid wages, improving her view of him.
Nan Xing and Xiao Wudi reconcile and work together on her novel, submitting it before the deadline. Nan Xing begins to suspect she has feelings for him.