Nine Reincarnations, Looking Back Thousands of Years to Find the Path

It's the 21st century, and there is nothing I like to do. One-fifth of the time in school has passed, and I know that I should find something I like and practice it half-life before retiring. The result is that one-fifth of life dominates four-fifths of life, interests have been wiped out and turned into ashes, and these four-fifths of life are all used to find the missing part of the one-fifth of life. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.