For Yan Yi, Yu Zeting is the person she desperately wants to forget, a scar that no one else can uncover, and the craziest adventure in her ordinary days when she was young. For Zeting, Yan Yi is someone he never mentions but never forgets. It was his first heartbeat in the days when he was young and rebellious. Yan Yi said that time always passes by inadvertently. I dare not think of it again, let alone expect that we will meet again.