JYJ's Jaejoong has been revealed to have written the lyrics for rookie Baek Seung Heon's debut song.

It was previously reported that Jaejoong was featured in the music video for "Until the Sun Comes Up". For the song, Jaejoong used his own sweet emotions as the background, writing the lyrics of a man who starts to fall in love with a woman.

If you have not seen the music video teaser featuring Jaejoong's kiss scene, check it out below!