The song she sings, "Only One", is produced by Park Soo Suk and Park Sun Woo and written and arranged by Park Mi Jung and In Woo, respectively.

With her lovely voice, the idol captures the emotions of the lyrics to add a fairy-tale like quality to the fantasy medical drama starring Ahn Jae Hyun and Goo Hye Sun.

Take a look at the OST MV above to check out not only the song but also scenes from the drama!