I think the reason why seoho "betrayed" and didn't unseal the dokkaebi is because he died, might got killed by someone or most likely sacrificed to save someone. Like the jeoseung chasa said, only those special ones are reincarnated. Either they lived as a good person or did something very heroic. It's obvious that minchan is the reincarnation of seoho, so possibly he died before he could unseal the dokkaebi.
Sorry if I used dokkaebi instead of his name, I literally forgot his name hahaha
And gwonryeom looks sus, aside from hiding the grandma he seems like he has feeling for minchan.
I think the reason why seoho "betrayed" and didn't unseal the dokkaebi is because he died, might got killed by someone or most likely sacrificed to save someone. Like the jeoseung chasa said, only those special ones are reincarnated. Either they lived as a good person or did something very heroic. It's obvious that minchan is the reincarnation of seoho, so possibly he died before he could unseal the dokkaebi.
Sorry if I used dokkaebi instead of his name, I literally forgot his name hahaha
And gwonryeom looks sus, aside from hiding the grandma he seems like he has feeling for minchan.