I should have included this comment in my post above but I really want to dedicate one post for YS. She forgot her commitment with CT just like that and she doesn't even remember it. Poor CT.
Also, I don't like how she is treating MK. She is not a friend. She is a self entitled "beach" in capital B. Granted that she's academically the smartest among the residents in their department but that doesn't give her the right to disobey a direct instruction from SYH. She thinks that being the most intelligent in their group gives her the edge, she forgot that intelligence is not everything especially in their line of work. Wisdom, compassion, and kindness are important, too. It's a pity that she hasn't realised that yet. I'm really glad YSH sees through her. Oh well.