You and Kim are close friends, you have a “sun and moon” type of friendship. You’re the moon because you’re always calm and grumpy, and Kim is the sun because he’s like a bright light of sunshine. He’s always happy and positive. 

Kim has never seen you emotional, ever. That’s because you barely show any emotions and he’s used to it and he loves you so much anyways. 

He does wonder why you are the way you are though, but he doesn’t want to ask you about it, since it might be a sensitive topic.