Gold recap and spirit knowledge
Yes, that's why Jaheon feels so angry when he sees Muhan. His soul that was Jaeheon in the past knows that Muhan was just a child. He treated Jaeheon with respect and loved him even though everyone else treated him as a fucktoy. He told Muhan to stay away but he didn't and then he ended up dying in a cruel manner. He probably blames himself as well because Muhan came running after him.
Oh my gosh, his gut reaction in the present could absolutely be self-blame! I didn't think about that, ugh, this is going to hurt so much T-T
lee muhan is the original body and soul, while the mugos are product of his torture. They're what we call "unfinished business souls", when a soul spends too long without guidance, they can begin to forget they were once human and had a purpose, that's when they become haunting entities, AND in some cases, people with certain skills would trap this entities in some sort of contract where in exchange of sacrifices of any kind, they tormented soul will give them something they want, whether that ir money, protection or getting rid of someone for them. That's how it work where i live, and i know it's a practice in asia too; so i based my theory in this fact, cause for the glances we've got so far, i think this is what happened to Lee muhan. Who mind you... is still a minor... like, they met when he was 13/15 and now he is 16... 17 MAX if we stretch it
mc past life is a luna, they were bought and sold as prostitutes/surrogates, so he doesn't like sol's because they are the ones that use and throw him as they please. But also, he's aware that Lee Muhan is different from other alpha's, that's where his care comes from, he knows him since he was a baby and have seen time and time again how he was a sweet child