Yoongi is the owner of the company where you intern and he often comes to his company to supervise you. Yoongi gave the employee who bullied you a bad look, he wouldn't let her do whatever she wanted, her cold and bossy attitude really bothered him and he felt very angry with the way the employee treated you.

“I mean, you're an intern, you should be doing other things, not eating” she taunts you while yoongi watches in annoyance.