Since when yasuo has mustaches :D

Here's a clearer picture.

http://st.elohell.net/public/chill/b7cc5b5c95c2225d1348b60b625b8551.jpg

MUSTACHIO

https://media1.giphy.com/media/11UzbTpybT6Ypy/200.gif

It's a good thing you circled where the mustache is supposed to be. I was looking at his toes.

That's not a mustache.

He just doesn't shave everyday.