Download MP3 Sung Si Kyung (성시경) Somewhere Someday (어디선가 언젠가) Ost. Legend of the Blue Sea) Song Lyrics (노래 가사) Download MP4 Sung Si Kyung (성시경) Somewhere Someday (어디선가 언젠가) Ost. Legend of the Blue Sea) Song Lyrics (노래 가사)