Lol yeah his parents wanted to meme the hell out of him so they named him that. And yes when Cain and Jooin met at the palace Cain spoke about their past lives. Not much said about it since then so I get why you're confused. I guess the situation is supposed to be ambiguous. I don't know how heavily this story will get into reincarnation or spirituality at all. The only other spiritual thing I noticed was Yahwi being into tea ceremony which is a very Zen Buddhist activity.
Let’s see if it has a meaning in the story or if the author just put the reincarnation thing in there and then forgot about it lol
Cain’s name Canis Lupus literally means Dog Wolf in Latin ahahah who’d name their son Dog? Btw I don’t know if I remember well but he said he was mc’s dog in his past life? I don’t understand a thing about him help ahahah