Is it falling in love with Eran? I had a slight suspicion, but I also thought that her sins were helping Eran. Also I'm thinking that the kings wife is human, and he married her so he wants Eran to marry her. Or his wife was human then turned into a demon. There is also her might be sin where she might travel to the underworld to save the senpai. The king might want to make her queen as well.
that's actually a pretty good theory... i don't think the king has a wife though because they all have different mothers
and yeah that or the reverse being he falls in love with her is what alot of us are rolling with
Hmmm that's true. Then it's one of his concubines. They don't know it though.
so i think by now all of us have figured out her sin
but am i the only one who thinks with the latest chapter that the guard figured it out?