Mugos are just Muhan's personality.

Soo the Mugos are just Muhan's personality. Muhan is the owner of the body, the original soul. The other three are just his split personalities, literally. Soo all four of them are fragments of one person that got separated to one another.

The torture happened when Muhan failed the exam I think? Here are some of my thoughts.

So when he got beat up, this is before they put Muhan inside the jar. This is also when monster mugo was born. The time where they're starting to torture Muhan by starving and beating him to death. They only give him raw food with venom in it. This explained to me why monster mugo is always hungry.

After he is beat up till there's blood flowing out of him, they placed Muhan inside the jar. Monster mugo was scared and that's when Bitchass mugo was born. He's the one stayed in that cramped dark space which explains his phobia(?) in dark and cramped spaces.

And last, the oldie mugo. I think before the torture happened, Muhan is already in the age where he is supposed to take exams or whatever to save Jaheon's family. Which explains why oldie mugo is arrogant and so articulate(?) ah basta matalino sya pota HAHAHA. BUT I guess he failed. One thing I noticed to oldie mugo is that, he is afraid of failing. Failing on protecting Jaheon specifically. Everytime oldie take over, he is the only one who could sense Muhan (before they go out to buy medicine then Jaheon got kidnapped).

I also think that Muhan's goal is to pass the exam or whatever it is to protect Jaheon but I'll guess he failed and his family is against his plans.

Sooooooo

Maybe Muhan was tortured by the people in the Luna village because the village only existed because of Muhan's family. But the Luna village hated that they're just being used as surrogates. That's why they created a "God" that would grant them wishes for the future of their bloodline.

When Muhan is already inside the jar, Jaheon was the one who's talking to him from the outside. When the torture is happening, Jaheon is maybe doing something? To save Muhan? But maybe it's already late he is still trying to save Muhan. And maybe that's the reason why Jaheon died outside the jar.

OR MAYBE

After the process of making a Mugo. Past Jaheon was the first one to be the sacrifice and the first one to wish to the Mugo .

FAK IDK THERE'S SO MANY THOUGHTS IN MY HEAD. I feel like I understand now and I don't . Anyways feel free to express y'all's thoughts with this. Idk how to explain my thoughts further now coz my brain is giving up and it's already late.