What is a 100 day kiss?

A "100 day kiss" is a term used in South Korea to refer to a kiss that occurs 100 days into a romantic relationship. In Korean culture, the 100th day of a relationship is considered a significant milestone, and couples often celebrate it with a special date or gesture, such as a kiss. This tradition stems from the belief that if a couple can make it to 100 days together, their relationship is likely to last.