I think the reason it is Kihoon bearing the consequences when Yeon was the one to tie that string is that, in the past life, when Yeon was dying (we see him struck by arrows), Kihoon must have made a bargain/deal/whatever with the red string boulder to take the consequences on himself. And thats why HE has the misfortune in this life, not Yeon.
kihoon didnt readily hop on that monster of a dick way back in ch 3 for y'all to call him a dominant bottom NOW.... he's always been driving the sex in this series, driving both yeon and us insane hahahahah
I think the reason it is Kihoon bearing the consequences when Yeon was the one to tie that string is that, in the past life, when Yeon was dying (we see him struck by arrows), Kihoon must have made a bargain/deal/whatever with the red string boulder to take the consequences on himself. And thats why HE has the misfortune in this life, not Yeon.