Thanks to SecretAgentMan for the following.
Lost Episode 4.07
Directed by Stephen Semel. Shoots Oct 27-Nov 9th. Figuring either a Sun or Jin flashback due to the Korean speaking guest stars.
Also, 'Huston', a 50ish salt & pepper haired authority figure, who( or whom?) you don't want to cross.
Source: SecretAgentMan@DarkUFO
