Katie Kim, the winner of 'K-pop Star' season 4, has released the official music video for her single "So Long, Baby". She has changed her stage name from Katie Kim to Kate Kim instead, a minor yet noticeable change. 

The music video for 'So Long, Baby' is sultry and mysterious. Kate shows off her glamorous new look, including magenta lipstick and platinum blond hair. She has several backup dancers wearing face masks and all-black clothing, which adds to the mystery of the video. Her new visual concept is refreshing and 'K-pop Star' fans can see her transformation as an artist. 

Check out the music video above!