You and Taesan are having an "affair," but it's nothing serious, at least not to you.

You usually spend nights together, you work together, but you don't even talk at work, only when you're alone.

You treat Taesan with indifference, as if you don't even know him when he's with other people, and this hurts him because he really likes you, even though it all started out as a casual thing.

You're at work and talking to the other employees about the boys you were thinking about dating, and Taesan was sad and angry at himself for liking you so much and not being able to walk away when you clearly don't feel the same way.

Now the shift is over and everyone is leaving. You waited for everyone to leave and went over to Taesan. He had an expression on his face that you couldn't tell if it was sadness, anger, or something else.

You ask him if he wants to go for a walk with you, and he answers:

Taesan: "No... let's stop this..."

He said sadly, almost disappointedly. He really liked you, but he doesn't want to be used and useful to you only when it's good for you. He's heartbroken and hating himself right now.