There are three unofficial “love” holidays on the 14th:
2/14 – Valentine’s Day – guys receive gifts
3/14 – White Day – girls receive gifts (Japan and Korea)
4/14 – Black Day – single people buy black-bean noodles to celebrate/cry about their single hood (Korea-only)
블랙데이 beullaek-dei – Black Day
짜장면 jjajang-myeon – Korean-style (Chinese) black bean noodles
Another fascinating article that discusses the increase in childless married couples and people who choose to remain single in Seoul.