While I can undestand why So Yi felt the way she felt and did what she did, I still wanted to scream at her like a banshee.
WTF!
Leaving aside my general preference for personal over political (and also, honestly, anyone who escapes the court nest of vipers should never go back if they value their neck being intact), there is the simple fact that does she really think it's a great idea to fuck up the emotions and take away last hope of a guy who's already both regicidal and suicidal and blithely believe that this will somehow make him see your way and turn out all right and not instead make him decide to commit suicide by palace guard in the process taking out the freaking ruler of Korea.
Smart.
Very.
GRRRRR. Am unhealthily protective of Chae Yoon.