In those youthful years that she still remembers, she spent her youngest years directing and acting in a huge secret love affair. In the end, she ended sadly with exhaustion and pain. According to the metabolism theory, all the cells in a person's body will be replaced in seven years. So after being reborn, will she and him meet again? At that time, those people, those things, those marks left by youth in their hearts swept over them like a tide. . . Is this another trick of fate, or compensation?