This is the 15332nd most frequent Korean word.
밸런타인데이인
"밸런타인데이인" means "Valentine's Day person" in English.
Here, '밸런타인데이' refers to the holiday named Valentine's Day itself.
밸런타인데이에 초콜릿을 주고받아요.
On Valentine's Day, we exchange chocolates.
In this usage, '밸런타인데이' specifies a particular occurrence of Valentine's Day (this year's instance).
이번 밸런타인데이에는 특별한 계획이 있어요.
This Valentine's Day, I have special plans.
Here, '밸런타인데이' is used to describe the characteristic ambiance associated with Valentine's Day.