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

Other days

hoodie

Hoodie Day
eat what you want

Eat What You Want Day
believe

Believe Day
offer

Offer Day
girl friend

Girl Friend Day
pick me

Pick Me Day
kiss a ginger

Kiss A Ginger Day
first love

First Love Day
boyfriend

Boyfriend Day
buddy

Buddy Day