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

Other days

polyamory

Polyamory Day
self care

Self Care Day
kale

Kale Day
blanket fort

Blanket Fort Day
brow

Brow Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
stud

Stud Day
singles

Singles Day
hot chocolate

Hot Chocolate Day