Day 1 — Your favorite song

err.... in the state of confusion.. I don't have any favorite song because I just love so many. Somehow I have to choose one to complete the challenge. I'll choose the latest song I've downloaded last night. 

Why I choose this song? I love Korean music, I know what the song is all about (after watching the one that have English subtitles) , I like the lyrics and the choreography so much.
not much to tell because this song is not the only song I love. =.=