Me too! I rooted for her since the beginning she met the Crown Prince.
Other dramas that I rooted for the second female leads:
Producers - Cindy!
Doctor Stranger - Neutral on this, but it wouldn't have hurt the drama if she ended up with the male lead.
School 2015 - Second female lead had better chemistry with the guy.
The Royal Gambler - Didn't really like the drama, but it was worth seeing if the second female lead ended up with the male lead.