Valentine's, then White Day, then Black Day in NE Asia

White Day: "Tradition dictates that the men who received gifts on Valentine’s Day must return the favor and give something in return to the ladies. The return gift is also called a “sanbai-gaeshiin”, since the gift the boy gives is supposed to be three times the value of the gift he received."
Black Day: Celebrated on April 14, those that didn’t receive gifts for Valentine’s Day or White Day will get together and eat noodles with black bean or white sauce to represent their “singledom.”