Black Haze

A long time ago, a portal to another world was opened, and those who acquired special abilities along with marks began to be called mages. After the incident known as "that day," the first-class mage from Ophion, known as "Blow," has become very famous. One day, he receives a very special mission: to protect the second son of the Artian family, who suffers from being called a "monster" at the magic school Helios! Thus, Blow enrolls in Helios under the name "Rood Krisch" to hide his true identity...

(Source: Kakao Entertainment Corp., translated)