How much is a one-way ticket from Seoul to Busan? The subway is convenient during rush hour. The streets are empty because of the cold weather. Is there a flight bound for Osaka? Seoul Subway Line 4 is blue. ★★★★★★★★★★★★★★★★ A: Youngsu, Have you traveled abroad a lot? B: No, I’ve been so busy that I’ve only traveled around South Korea. A: Then, of all the places you’ve been to, which one did you like the most? B: I liked the East Sea I visited last summer the most. A: What did you do there? B: I saw the sunrise, and it was like a scene from a movie.