After Graduating from Senior Year, You Learn to Eliminate Demons from Your Tutor

[No system + non-travel + slightly middle 2] In the first semester of his senior year, Mo Wen, a software engineering major, was worrying about his graduation project, but he accidentally discovered that his middle-aged bald tutor actually had another hidden identity! And as this hidden identity was revealed to Mo Wen, the turbulent storm hidden under the peaceful city began to sweep towards him. Strange devil! An alien creature that does not belong to the earth has caused a series of tragedies unknown to the public, seriously endangering social stability and may even pose a threat to the entire earth! The accident that killed both of Mo Wen's parents ten years ago turned out to be the work of a strange demon! Maybe it was for revenge, maybe it was for the so-called righteousness, no matter what, Mo Wen, who was originally planning to work as a security guard after graduation and wait to die, began to follow his mentor to learn the art of eliminating demons, joined a special organization, and vowed to exterminate the world's strange demons! However, only alien demons can deal with alien demons. If you want to eliminate demons, the first step is to sign a contract with alien demons and become a demon master...