Troubles escalate when Jin attacks Micheal for no reason. Soon, another secret is revealed when Sun reveals to Michael that she actually speaks English and is afraid of her controlling and jealous husband. Meanwhile, Jack goes with Kate, Locke and Charlie to the water source, and comes up with an idea: to move all the castaways into the caves. Jack and Sawyer try to convince Kate to move into their side. Also, Locke finds out about Charlie's heroin addiction.