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"Scar" was released on February 9 and showcases Yoo Sung Eun's ability to bring out the heartfelt emotions of a song with her powerful vocals. Bonggu was also able to sing in the song's original key and expressed the inevitable ups and downs that come with a relationship from a male's perspective.

Meangwhile, Yoo Sung Eun is also starring in the Mnet music drama 'Perseverance, Goo Hae Ra'.

Check out the duet above and the original below, and let us know what you think!