'Black Day (April 14) is a South Korean informal tradition for single people (a.k.a. Unit Solo/Solo Regiment, Korean: 솔로부대) to get together and eat Jajangmyeon (noodles with black bean sauce), sometimes a white sauce is mixed for those who did not celebrate White Day.

The idea is that those who did not give or receive gifts on Valentine's Day or White Day can get together and eat Jjajangmyeon (짜장면), white Korean noodles with black bean sauce (hence the name), to commiserate their singledom.'

So i asked them, why do we have to eat ja jang myeong?

And their ans is 'because it's BLACK!'

Haha is this even a celebration? The whole day seems so gloomy!! Haha my single friends, lets get together and eat 炸酱面 together on black day next time!!! hahahaha...