For me it’s the opposite... the novel made him sound incredibly old, ready to retire in fact, and he always has someone with him cause he’s in the top of his game anymore, even though he is intimidating... so I always imagined him being fit like that but much older... kinda like a Yoda lawl ╮( ̄▽ ̄)╭
He actually looks quite similar to how I thought he would. But like even though he's an old man I though he'd be more handsome (not in the omg he's so damn fine way but in the you know he was a snack back I the day type way) lol
He was too old when he was awakened (some health concerns already popping out, he is possibly the strongest S rank of the first 9... but with his declining health...) but still, that wrestler body tho...
So that's Go Gunhee,,, he looks older from what i imagined lol. Mad respect for this grandpa (๑•ㅂ•)و✧