White Day is basically just another Valentine's day, only based in Asian countries. On V-day, women give chocolate to the men in their life. And on W-Day, the men do the same for the women (usually white chocolate)!
Happy White Day! (IK I'm a bit early but what the hey!)
"White Day is a day that is marked in Japan, Taiwan, South Korea, Vietnam, Hong Kong, Malaysia and China on March 14, one month after Valentine's Day." -Wikipedia.