Back to the Year You Didn't Want Me tells the story of Lin Yiyi, who discovers on the eve of her wedding that Xu Chengyu once hid the keys to Bitcoin worth millions of dollars in a childhood memory box. On her wedding day, Xu Chengyu rushes back from the United States and sings their old song as a guest, causing Lin Yiyi to break down and faint. When she wakes up, she has returned to the year she started university. The two, who once loved each other before going their separate ways, stand once more at the starting point of fate. This time, she will reclaim everything she suffered, while he finally begins the redemption he owes her.