Global Dungeon: My Support Is Too Strong - Chapter 71 - Origin Grade Monster

In the current era, people are either normal or are with ‘special abilities’. Cases related to the latter are managed by the “National Anomaly Prevention and Control and Special Species Management Office”.
Qi Zheng Emperor Sheng Lingyuan was reawakened a thousand years later after he jumped off the fiery Red Lake. Xuan Ji, a newly transferred staff to the Reparations Division of the Deviant Control Office, finds himself having to clean up the mess of a revived tyrannical monarch. The two seemed to share something from the past, but unbeknownst to them, a big conspiracy is stirring right underneath their noses that could destroy the balance of the world.

- Description from Novelupdates

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

Kurono Maou is a high school student who is sensitive of his sharp eyes and bad expression. No girlfriend but gifted with friends in his own way, he had been living a peaceful life.

“Sarah, I promise to help you rise again, to bring back the light to your career and take down whoever shall stand in your way, but in exchange, be my wife” Mason whispered.“I... I appreciate your offer, Mason, but a contract marriage? Can we really keep it a secret?” Sarah returned reluctantly.In the aftermath of a heart-wrenching betrayal, Sarah Chen, the esteemed songstress of Wuhan, crosses paths with the Mason Liu. Heir to Asia's most influential dynasty, Mason, with promises of restoration and secrets, proposes a contract marriage to Sarah in exchange of helping her bounce back to her position as number one of Wuhan. As she hesitantly agrees, will Sarah find not only a path back to stardom but also an unexpected journey of love and self-discovery in Mason's perfect world?