by the way a little something to read ..
Valentine's Day has spawned celebrations of love beyond western culture. In Japan and Korea, Valentine's has become almost an obligation for women to give chocolates, known as giri-choco, to all of their co-workers. A reciprocal day on 14th of March known as White Day has emerged in recent times whereby men are supposed to thank those who remembered them on Valentine's Day with white chocolate or marshmallows, hence white day. In Korea there is an additional Black Day, held the following month on the 14th of April, for less fortunate men who did not receive gifts on Valentine's Day to gather together to eat Jajangmyun, Chinese style black noodles topped with a black sauce.
BBC - Religions - Christianity: Saint Valentine