18-years-old writer Su Meng has written her first romance novel 'Give You My Heart'. In the novel, she created a villain named Mu Si Chen who is smart and cunning. One day, Mu Si Chen comes to her house and forces her to let him live with her. Mu Si Chen's arrival makes Su Meng's life miserable and changes everything in her life. Despite the many things that happened, Mu Si Chen is gradually moved by Su Meng's warm spirit unexpectedly falling in love with her without realizing it.