Mr. Queen S01 E14 A Woman Who Must Die To Live

"Was I fooled by your deceitful eyes and lies?"

So Yong gets drunk and mistaken Cheoljong for Hong Yeon. So Yong starts avoiding Cheoljong when she finds out that they spent the night together. Cheoljong gets upset because So Yong treats him harshly. Meanwhile, someone comes to see Cheoljong and tells him that So Yong is in danger.