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In his sophomore year of high school, Yu Chenan rescued Yang Yi who was in trouble and became roommates with her. Yu Chenan became depressed and gloomy overnight because of Xia Nan's deception. As a deskmate, Yang Yi's unintentional move gave the male protagonist a hand. After that, Yu Chenan reciprocated the favor with him. The two fell in love with each other, but eventually separated due to Xia Nan's misunderstanding. In college, Yang Yi tried to fall in love with Bai Yang, but she could not forget Yu Chenan who had never hurt her, so Yang Yi and Bai Yang broke up peacefully. And Yu Chenan has been waiting for a promise to arrive. For that unrealistic promise, he would look at his old mobile phone every day before falling asleep. In the address book, there was the only number without a name...

Becoming an immortal is not what I want; what I have wanted in this life is just a moment.