Key starts to coughs.

JongHyun released him and gave him his handkerchief.

"Key-ah, your cough haven't cured yet? Didn't I told you not to eat sweets too much?" JongHyun sighed.

"S-Sorry" Key smiled weakly, he hold the handkerchief tightly like hiding something from the other boy. His pink lips looks paler than usual.

JongHyun frowned as he noticed something red-coloured on Key's lip. "Key, what is that? I-Is it blood?" The elder boy tried to wipe it, but Key have wiped it earlier