I've Traveled Through Time, but I Have a Knight System

My name is Su Mu, 18 years old, an ordinary high school graduate. I rarely eat snacks and drink only lightly. Go to bed at twelve o'clock in the evening and get up at eight o'clock the next morning. Before going to bed, I first watch videos, then listen to music and read novels. Until one day, an accident happened... … This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.