Su Yubing's ordinary high school life began to look different, which made Su Yubing still want to go back to high school after going to college. He didn't know how to time travel, and he didn't have a system. The work is bland and slow-paced, and this is the first book for a novice online writer. It's not good and boring, so please forgive me.
Purpose: Friendship is the most rare gift for human beings