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The most fashionable main song of the soundtrack, which is the opening track, known as "It must be You" which was sung by YeSung from K-pop group, Super Soph. The ballad was #1 in online music sales in from late April to early May this year's. It also gained popularity in ringtones in Korea. The lyrics to this tune describe the romance between Song Eun Jo so fine. It begins with the lines "Today I am wandering with my memories again, Standing individuals will of this road, You are holding onto me even though I cannot see you again, Much more I'm stuck on this roa