Unparalleled After Ten Consecutive Draws - Chapter 1974 - Nine Kings Out of Cultivation, Nine Kings’ Biggest Secret, Primordial’s Disciple, Wu Mian

The most feared Assassin in the world died because of vengeance.

As a cultivation genius who has achieved a new realm every two years since he was a year old, Wang Ling is a near-invincible existence with prowess far beyond his control. But now that he’s sixteen, he faces his greatest battle yet – Senior High School. With one challenge after another popping up, his plans for a low-key high school life seem further and further away…

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.