When she's about to leave

"If you love 2 persons at the same time, choose the second one because if you truly love the first one, you wouldn't have a space in heart for the second one." 

University Love [Part 28]

Once the arguing couple settled down, everyone is relieved except for one girl, Sulli.
She's still crushing on Krystal without reason. Both don't even know each other well. Probably Sulli loves Krystal beauty. Who knows?

They aren't throwing party or anything since Krystal's brother isn't cool about it; therefore, all decided to go home. Amber dropped Krystal, Luna, and Sulli home.

University Love [Part 27]

          Classes have never been interesting to Amber, but they are to Krystal, like really are. Amber would, most of the time, check her phone or mess with Krystal, but Krystal always stay focused in class and also very annoyed of Amber. Until then Krystal couldn’t hold her emotion anymore because Amber has been bothering since the first session.