In order to get close to the girl he likes but fearing rejection, the sunny Zhou Yizhe "dates" with the girl's best friend. However, when he gradually forgets who he loves, can he still go back? Youth is a sweet and sour taste like lemon. It brings back a memory - first love. The more bitter and sad I feel, the more I want to go on. When youth encounters frustration, when happiness faces loneliness, where should everything go? Romantic stories are dancing lightly.