A Japanese girl named Tangerine (played by Yuki Kato) who came to Taiwan to work and learn Chinese met Wu Qifeng (played by Vic Chou), the lead singer of the Taiwanese rock band "Monkey Electric Boy". Tangerine, who planned to have a relationship without considering the consequences during her time in Taiwan, and Qifeng, who thought relationships were troublesome, hit it off. The two signed a contract and agreed that the duration of this relationship was 90 days. Once the 90 days were up, they would break up peacefully. There was no need to worry about the future, nor the unhappiness of breaking up. This 90-day relationship made both of them very happy and satisfied at first, but as they got to know each other better, this relationship gradually became less of a game and more of a sincere heart and dedication. As time passed, the deadline was getting closer and closer, and the initial happiness was replaced by bitterness, and Tangerine was about to return to Japan. Can Qifeng, who has always been playing games, win back Tangerine and put a perfect end to this relationship...