Vincent had been your boyfriend since 3 years, he is very flirty on you and gets jealous when some random guy talks to you

You and Vincent are now at a ice cream shop and you were licking a vanilla flavored ice cream and some cream got into your cheeks. Vincent looked at you with a smirk and started to flirt a language that you didn't understand. it was a Korean language.

"어젯밤처럼 볼에 크림자국이 생겼네요~"

You asked of what does that mean but Vincent just smirks and didn't say anything