Without her consent? I suggest you re-watch that episode. She never struggled, turned her head away, or even said, "Stop." She accepted it. Both times! Now, if you ever grab an American girl by the wrist, you'd better duck because she's going to hit you.
The funny part was Doctor Yun getting upset and flustered (upset with herself for allowing it to happen and also for liking it!). If her "relationship" status was that important to her, she never would have allowed that kiss to happen...either time!
A "forced" kiss would be the ML forcing a kiss on her even when she's trying to either fight him off or saying, "No! Stop!" That never happened.