Jin is the only major character who could not speak English before arriving on the island (though he does speak it in one of Hurley's dream sequences), and has been receiving tutelage from Sun and Sawyer. Ironically, Daniel Dae Kim has the opposite problem: though Korean-born, he was raised in Pennsylvania, speaks English as his native language, and had to receive tutelage in Korean to prepare for the role. Despite Jin's inability to speak English, he can understand it better than most characters think, deducing that Sun and Sayid are lying to him in "The Glass Ballerina". He manages only rudimentary English by the end of season three, but by the end of season four, he can understand most of what is said to him, and can speak English with minimal difficulty. Furthermore, after living for three years on the island, as shown in the episode "LaFleur", he is fluent save for an accent.