Boey is the best person you will ever meet in your entire existence, they could and probably will change your life for the better. If your ever get to meet a Boey of your own, consider yourself lucky.
Ulzzang true definition is "best & "face" = best face in korean. They are basically people with above average looks, sometimes with the use of photoshop and haduri who post their pics online, some becoming internet celebrities.
"Hey, see that chick over there? She's pretty enough to be an ulzzang. :D"