Suddenly

The ballad "울컥 (All of a Sudden)" has Krystal lent her voice for Part 2 of her starring drama 'My Lovely Girl' OST. The song was unveiled on digital music sites at noon on September 25. The song "울컥 (All of a Sudden)" was first revealed on the third episode of the drama, and reports said it climbed the search engine lists immediately upon the end of the episode.