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

Other days

gallery

Gallery Day
lost sock memorial

Lost Sock Memorial Day
gum

Gum Day
eat what you want

Eat What You Want Day
ride the wind

Ride The Wind Day
bow tie

Bow Tie Day
boba

Boba Day
youth

Youth Day
stud

Stud Day
ruby

Ruby Day