He's not happy anymore!
He's upset that Mr. Hwang didn't tell him it'a belong to Jin Woo's mother
Even Jung Yeon!
Or Im Tae Ho
Even his senior
(But better don't talk to him!^^)
So...Don't make Si Yoon angry again!
Otherwise...you will end up like this!^^
Credit : gall.dcinside.com/parksihoo, thank you!