You make my head BUM
Umm can I share my think? I think it's about childhood memories? Like you know there's spoilers about Jooin met Yahwi back when they was a kid. Maybe it's the same case with Cain, they met at a place somewhere when they was kids. Well Waje-nim love to make a fated couple with childhood memories with them
Oh you're right. Haha I forgot that this isn't a fantasy manhwa, lol sometimes I'm being such a dumdum XD. This is the effect of too much reincarnation and yaoi fantasies/supernatural XD
Sorry XD
Is it possible that maybe Cain remembers their past lives wherein jooin is yahwi's lover but then cain love jooin in the past but it's an unrequited love and that is why he is trying to steal jooin from yahwi in the present time.