The days at school are indispensable for the humorous stories of youth, and those who create these stories are the bunch of close friends around me and the people I love most. Time on campus goes by in a hurry, and parting is inevitable. We each leave with the scars left by our youth, thinking that maybe one day we will meet again, but you may have changed by then. Unconsciously, the tide of pain has soaked into my body. By chance, Zhixian returned to his middle school days and redeemed his past mistakes. Will this be an opportunity given to him by God? What on earth left such an indelible scar on her twelve years ago?