It's 
#HangeulDay ( 
#한글날 ). 
#Hangeul is a script that can be adopted & adapted for various languages far more precisely than Latin/Roman.
Here's Mabuhay Hangeul v1.0 (wip) for 
#Filipino in Hangeul. (v2 soon)
 YourOnly.One wiki#Hangul #HangulDay #Philippines #필리핀
YourOnly.One wiki#Hangul #HangulDay #Philippines #필리핀