Fresh graduate Ke Miantang accidentally transmigrates into a novel, becoming a vicious supporting female character with a tragic ending. To survive and receive a 100-million-yuan reward, she must play the role of Rong She, a possessive heir's spoiled girlfriend for 150 days, then leave on schedule once the original heroine appears. She initially thinks this is merely a mission, but gradually falls for him amid his repeated favoritism and indulgence. Meanwhile, Rong She, who was supposed to fall in love with the original heroine, has already become hopelessly devoted to her. As the plot continues to stray from its intended course, Rong She realizes that the woman before him is not the original Ke Miantang. When she puts on a wedding ring and prepares to leave while concealing her identity, he has already begun searching for the real her. "Baby, I'm here to catch you."