Actor Song Joong Ki has lent his voice for the OST of his starring drama, 'Nice Guy'.

The song "Really" is a ballad that serves as the theme song between Song Joong Ki and actress�Moon Chae Won. It has a poetic melody along with heart-wrenching lyrics, relating to the couple's love story on screen. The song's lyrics were written by�Kim Ji Soo and composed by�Kim Ji Woong.

Check it out below!