At this point, sunbae's gonna go byebye. He's just there for the extra spiciness and drama. MC basically has his life tied with God Hyung seeing as they had a deal. And if MC betrays God Hyung? Then he's a total ass.
It takes a while for the story and the characters to build up. Like until chap 20 plus. For now, there is most probably a tragic reason as to why the ML is like that. He ain't that bad at all if you compare to other toxic mls.
What a beautiful masterpiece