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"Sung-Joon" is a slang term for someone who purposefully irritates others whilst acting oblivious to his/her actions.
Person X posts a photoshopped picture of Y to irritate him/her

Y: "why did you do that?!"
X: "ha...what are you talking about?"
Y:"You know what I mean!...your such a Sung-Joon"

Another example:

Person X falsely claims to have beaten up person Y in a sad attempt to gain clout from his/her peers.

Y: "Why are you telling people that you beat me up?"
X: (Giggling)"because I did"
Y: "What are you on about? Your such an SJ!"
Sung-Joon by O-Poggers August 8, 2020
Related Words

Joonsung 

The best human being in the world and so good. Everyone loves him
Joonsung is good

Joonsung 

The hottest guy on the planet. Typically seen brooding and staring out of windows, the Joonsung is quite handsome. The Joonsung is also typically a dumbass.
"Why are you chewing on your pencil? You're being such a Joonsung."
Joonsung by DAN THE FOOT MAN October 7, 2021