Koreans don't really celebrate Mothers Day - they have Parents Day, which was last week actually.
Rumor has it that this day was originally Mothers Day, but fathers complained it was unfair and so it became Parents Day. It think it's clever to combine it all in one day. Back home we have two separate days - Mothers Day and Fathers Day.
I called home to wish my mom a happy day. Before hanging up my day said something quite hilarious to me: "tu es un superbe spermatozoide ma belle!" hahaha