Oops, it doesn't look like 'yoonyul day' is a national day..

Other days

cursing

Cursing Day
boy friend

Boy Friend Day
lash

Lash Day
self care

Self Care Day
special education

Special Education Day
kale

Kale Day
reading

Reading Day
blanket fort

Blanket Fort Day
bubble bath

Bubble Bath Day
tulip

Tulip Day