Not really have you watch hunter x hunter. Yk meruem and kamui? Their relationship is similar to that. The ml and ryeong actually met technically when they both are kids. It's their first meeting ever after ryeong run away from home. A little spoiler
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For context the ml was create as a vessel and he was like 3 year old and he does not understand emotion. So it's like giving power to a child with a grown up body. Their first meeting. They were both technically kid. Their second was when they both were adult and due to some stuff the ml had to revert back to his child form and they meet again in the current storyline and the fourth would be in the dream demon chapter where we discover ryeong past.READ IT

No good read nowadays (/TДT)/