@bok and blog, I frequently transit the terminal when trying to make a connection. GD in hand, but a change of clothes clearing customs.
Always cancel your transport, and beware the South Korean or Chinese grade 2 who will report you if they see you, best to just tell the FO etc.
I have a couple of other things I do that keeps me under the radar, all common sense stuff, but nothing I'd post on an Internet forum, been doing this for the entire time I've been here, never had a problem.