A Passer-By Mentor Leads a Troubled Girl into the World

In a Western Fantasy Academy where there are many heroes and Long Aotian is rampant, everyone believes that the important task of saving the world will fall on the shoulders of those "sons of destiny" who are born with supernatural powers. However, a real crisis requires a "mentor" who can see through people's hearts and repair their souls. So, the world (or the God of Destiny) half-jokingly chose a "passer-by" with low magic power, mediocre qualifications, but so much confidence that he could be called arrogant - Renn.