Yes Lee Muhan is a human, beings like Mugo was created from a human that was tortured so bad that their soul turned into a spiritual being. The 3 split personality comes from the torture process correct me if i'm wrong, the 3rd personality comes from the fact that he was starved for so long, 2nd personality is claustrophobic from the torture, 1st personality has inferiority complex because Mugo isn't a "God" That ascend but rather a vengeful spirit as per the well god said
Correct but what I don't understand is Well God was saying that he thought that Lee Muhan was Mugo's 4th personality but he is completely different and a tortured human soul who barely remembers anything to function. So wouldn't that mean that Mugo is completely separate from Lee Muhan. Maybe born from him but still separate from Muhan? A new entity born from torture using Lee Muhan as a host?

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