I dont think there will be actual cheating. I think its gonna be a misunderstanding of yeoreum's own making. Hyeonseon will think he is cheating bc yeoreum is gonna be distant and avoidant bc of his family shit, he is gonna hang out with friends to avoid it all and hyeonseon is gonna see them together, and in his mind its gonna solidify his previous concerns from season 1. I dont think itll be an immediate confrontation on hyeonseons part tho. I think hyeonseon will start ro avoid yeoreum bc he doesnt have enough proof of the "cheating" so its speculation that he doesnt want ro confront until he snaps and his snapping will force yeoreum to confess everything he has been avoiding. And hyeon will comfort but be hurt yeoreum doesnt trust and rely on him.
I dont think there will be actual cheating. I think its gonna be a misunderstanding of yeoreum's own making. Hyeonseon will think he is cheating bc yeoreum is gonna be distant and avoidant bc of his family shit, he is gonna hang out with friends to avoid it all and hyeonseon is gonna see them together, and in his mind its gonna solidify his previous concerns from season 1. I dont think itll be an immediate confrontation on hyeonseons part tho. I think hyeonseon will start ro avoid yeoreum bc he doesnt have enough proof of the "cheating" so its speculation that he doesnt want ro confront until he snaps and his snapping will force yeoreum to confess everything he has been avoiding. And hyeon will comfort but be hurt yeoreum doesnt trust and rely on him.