To My Past Self

One day, Jeon Wonwoo receives a letter written to himself from ten years in the future. As he reads on, the letter includes the exact events that happen in that day. Including the transfer of a new student named Kim Mingyu. The future Wonwoo, repeatedly states of his many regrets that he hopes his past self can fix, most importantly regarding anything with Mingyu. More shockingly, the Mingyu from the past is no longer with them in the future. Future Wonwoo asks his past self to watch over Mingyu closely.