Lovers in a Time Loop

30-Year-old Su Nian has a cold marriage, and she always misses her college boyfriend. Lin Chen, 28, is Su Nian's subordinate and her best friend. He loved her silently, listening to the memories of her first love that she missed countless times, and his heart was filled with bitter jealousy. By chance, Lin Chen got the opportunity to travel back to school. He made up his mind to have a perfect relationship with Su Nian. After time traveling, Lin Chen quickly fell in love with Su Nian. However, as they graduated, interned, and worked, the two gradually became estranged due to various practical reasons. Lin Chen finally realized that he was the ex-boyfriend who "died without a problem" in the future as Su Nian said. His time traveling did not change history and could only become a memory.