she was holds gas to be able to swim better / or learn to swim, she was choosing food to get gas before swimming. It's scary.. Some trainer or rescuer advised her against it because it is dangerous to health
I don't hate Yoo Jae Suk but sometimes he is annoying when he shuts someone up when they're talking. I know it could be scripted but it's annoying af as if he wants to always be the main character..