
But didn't they meet eeeeeeeeven before first? Like centuries ago? As adults? I think it was just the spirit of his past self, he doesn't remember kid mc on this new life.
Actually, how does this work? Like is the MC older than seme? Like, if the seme appeared in spirit form to him when he was a kid, does that mean he wasn't incarnated yet?

I think you got things confused. Neither of them remember their past lives, seems like something happened and past life mc is involved in past life ml death (though we dont know exactly how). From what i understood, ml was some kind of god or spirit, and maybe his death is the reason why in this life hes just a regular human. The scene with mc as a kid seems to be their past lives by the clothes he was wearing, and for some reason, mc is dreaming about his past life.
So, by the flashback, that seems to be how they met for the first time in their past lives, mc still as a kid, and ml in his god/spirit form
(Idk if i explained well)
Of couse they met in their previous life while mc was a child, seriously why is it always like this?? Every time that ml is some kind of god or immortal being he AWAYS have to met mc while he was little. Its so weird, i cant imagine liking and having sex with someone that you met while they were a LITTLE KID and you a grown ass adult, i would see them as a baby forever