Jang Suk-Hyun is an overall irritating character right about now. He's too stiff to me. And if he loosens up, maybe he'll seem better, I don't know. I like Jang Ti-woong. He brings so much life to the show and he's innocently sweet and charming.
I think 'Go JooWon' would be the closest, but I would put a hyphen in 'Joo-won'. But there are so many pssible variants. 'Go' could be written 'Ko' or 'Koh'. 'Joo' could be 'Ju' or 'Chu' or even 'Choo'.
You could also try searching via Hangul. Of course, if you can't read the results (like me), it's not a lot of help.