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Bihwan said he wanted to eliminate death so he and seoho can stay together forever without dying but I feel like this seoho guy was probably working with Gwonryeom in the past and was trying to use Dokkaebi powers to eliminate death Aka yama. Because Bihwan said seoho never allowed him to go all the way with him. But seoho probably fell in love with bihwan and in order to save bihwan he sealed him in that space and ruined Gwonryeom's plan of eliminating Yama.
Now years later Gwonryeom's found minchan again to achieve his goals as minchan is the only one who can free Bihwan so he probably plotted the high-school tragedy and sealed his grand mother? (Cause we all saw her in his house) He probably want to use them to achieve his goal idk. We will see.