Former SISTAR member Hyorin will be singing the first OST for new KBS drama, 'Black Knight'.
Hyorin's OST "Spring Watch" will be released this December 20 at 6PM KST online on domestic music charts. The track was composed by SM Entertainment's Kenzie and Lee Na Il.
Meanwhile, 'Black Knight' tells the story of a man who accepts a dangerous fate to protect the woman he loves. It stars Kim Rae Won and Shin Se Kyung.