The talented songstress Gummy has surprised fans with the release of a song today for the OST of upcoming drama 'The Sun of My Master'!

Her song "Night and Day" is the first OST in the lineup and it's the work of Kim Se Jin, PJ, and Choi Kab Won.

To see how her song fits into the drama, you'll have to tune in when the drama premieres later tonight (7th KST)!