I Can Only Code, but They Asked Me to Be a Teacher

In his previous life, he was a ruthless killer, but he was reborn as a prolific online writer. In order to earn medical expenses, he was invited to be a teacher. He met a student with supernatural powers. In order to make the students obey him, he had to use his long-discarded powers to lead the students to defeat the dark forces! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.