Replying...
Intro. He a normal student that go into isekai and after saving the world from isekai ,he actually come back in korea. But when he come to his house,he just know that her mother die from a car accident to find him when he lost for about 8 month on isekai. His die jump out, he got expelled from school because didn't come to school in 8 month, his friends betray him and he didn't have money. He completely heartbroken and emotionless,he start to burn the whole worlds and didn't care at all. He tired. After everything he do for them. (he was sword hero back then)

Kim Min-Su (sword hero)

@Mimimi