Actor Song Joong Ki will be singing a song for his 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.

Song Joong Ki's soft voice is said to have worked perfectly with the song, and expresses the feelings felt by his character better than anyone else for he has the best understanding about the drama and the character he plays.

"Really" will be released on the 31st