hello I’m under the water

I don’t remember super well but he’s like the OG owner of that body. He basically went through a bunch of traumatic shit in the past while he was still human and he developed a new personality to protect himself against what he was going through and he continued to develop new personalities until he, Lee muhan, the original human owner of the body kinda got pushed super far down into his consciousness for years and years while the other personalities took over and somehow became like a god ig. I don’t really remember how he gained powers but yah

I don't know the reason they put him (Lee Muhan) throught that but, the goal of the Kang family was to create a cursed God tied to them to execute their wishes. The process of creating a cursed god was so excruatingly painfull and horrible that Lee Muhan went crazy and died (which was the goal to create a "god"), and what came out was Mugo, the evil god. He did not however emerged as one entity but as 3 distincts personnality. As Lee Muhan's soul did not left the earth, it got attached to its original body, and that's why the Mugo we know kept having flashbacks and all.