Yong Yong

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...

Charlotte Eleanor is an Archmage that once saved the world. Using her magic to die, she instead, reverses the age of her body to a young child and starts a second life as Aria Lissen. She had a fulfilling life in her first lifetime, except for one tiny regret. In this new life, Aria is determined to find and live for that one thing she never had… LOVE.However, she comes to find out that her 'demise' was nowhere as inconsequential to the world as it seemed, and certainly not to her mighty Five Disciples, who aren't coping that well with her loss.

After a mission gone awry, the doubtful main character, Rood, is sent to a famous magic school, Helios. Here, he must protect an important person's son who has a very bad time at the school. (Source: MangaUpdates)