That's the back of guest star Billy Baldwin. His dirty ex-cop isn't making things easy for Kono.
Added:
Look out, trip wire! Chin almost ended his own life by accident her.
Added:

Hawaii Five-0 Season 2 Episode 3 Quotes

Hey Creepy, why are you dressed like Inspector Gadget?

Steve

Steve: Thing is Joe, you're not a hang loose "fun in the sun" kind of guy.
Joe: They let you stay.