An Yuner, a product designer at the University of Hong Kong, receives a simulation prototype for her company's internal testing. When she opens the box, she is shocked to discover that the robot is a replica of Shen Yan, the cold-faced CEO. Shen Yan was her senior at university. Five years ago, she helped him after he fell off his bicycle, and he has secretly loved her ever since. He deliberately entrusted the simulation project to her. At home, she freely bosses around the obedient "Yanyan," and her heart flutters repeatedly after unlocking lover mode. At work, she feels guilty and nervous whenever she faces the demanding Shen Yan. When the prototype is sent back to the factory for repairs, Shen Yan disguises himself as the robot and personally takes care of her. Drunken mishaps, fever, and a series of misunderstandings follow. A slip during a phone call exposes the truth, leaving An Yuner furious and distant. At a matchmaking gathering, Shen Yan boldly interrupts the proceedings and confesses in the snow that he has secretly loved her since their youth. After five years of quietly holding back his feelings, their love finally finds its happy ending.