I remember this tee and I wanted it so bad!! Sadly, I couldn't find it...T_T Turns out it is by Second Food. I can't seem to find anymore info on this brand. :(
Not much info given or at least I couldn't understand it. It was a Korean site called Hip Hoper.
This shirt is called Second Food I am King shirt.
Credits: K-world Style, Youtube, Hip Hoper, Second Food