1. Seo Yul didnt cross the line. He told her that he is confused and let him hug her for a second etc. Naksu accepted…
he just cares for her, since they have known each other since they were young.+ He also knows that Naksu is Jang Uk's, so he would never do that. Yun Ok isn't someone to worry about. Jang UK has, since Part 1, made clear that he doesn't like her. So no worries.
I was thinking maybe it could save someone. Mama Jin said that a parasite is eaten by a bird.. so I was thinking... maybe... it could be useful. Or could even save Naksu or Jang UK in the end since "someone should die" or something like that...