Wait I think I'm getting the story not sure if it's correct buttt I think this is their first life these are jus flashbacks the mc gets aka his dreams and so in this life something goes wrong ( referring to the earlier ch where ml was dying and was covered in blood ) and so after he dies the mc who's actually a shaman in this life ties thier fates together and so they always meet in every lifetime ( also had a past where they knew eachother since kids the one where they're in highschool together) and mls brother def has something to do with their first fate and maybe why he's also tied to their fate and so he's present in this life as well