Thanks ShizukaAoki!
There are other ways to sprout some conflict between Sumin x Sungji, but they chose the love triangle route. And they, for some reason, really wanted to have that "caught in the act" scene....okay. But thank goodness that they do realise that there's still a lot of things to say in the story. Hope they'll be able to pull it off....
The issue of what Sumin should do to not let Sungji become Seju's
I wonder if they just confused the names, or it's really what's written...