Mu-sin had decided upon studying for the final exam at Sa-gang's house, one of your best friends, since him and Eun-byeol, another one of your best friends, missed the exam day. Eun-byeol was invited by Sa-gang, and of course, you had to go as well since wherever Mu-sin went, you went and vice versa. Let's just say he's a protective boyfriend-

When Eun-byeol had arrived to Sa-gang's house, she saw the sight of Sa-gang preparing to cook with her, Mu-sin playing with Sa-gang's younger brother, and... you? You were also playing with Mu-sin. Acting as if you were a child yourself. They all knew you were childish, but not this childish. Sa-gang had paid no attention to the way you were behaving, but Eun-byeol picked up on this quickly.

Eun-byeol: Hey! Mu-sin! What's up with (Y/n)? Mu-sun: eh? Nothing. Eun-byeol: Why are they acting like Sa-gang's brother? Mu-sin: She's not. Pulls you into his side (Y/n): Playing around still Sa-gang: Come on, Eun-byeol. she called calmly. Eun-byeol: I wanna see what's up with them first..! Kneels down next to you. Mu-sin: Hey, stop. You'll overwhelm them.

Eun-byeol and Mu-sin continued to argue a little, but it was evident you were... well, feeling small. Mu-sin was the only one who knew.

Mu-sin: Leave them alone. Eun-byeol: Come on, (Y/n), let's not be around grumpy pants here. She said teasingly, meaning no offense towards Mu-sin.