D.O. - Simple Joys (우리가 몰랐던 것들)

D.O. - Popcorn

D.O. - I’m Gonna Love You (feat. Wonstein)

D.O. - Rose

D.O. - I’m Fine

D.O. - Rose (English Version)

D.O. - Ordinary Days (내일의 우리)

D.O. - Somebody

D.O. - That’s Okay

D.O. - About Time (어제의 너, 오늘의 나)

D.O. - I Do (별 떨어진다)

D.O. - My Love

D.O. - Si Fueras Mía

D.O. - Mars

D.O. - Dad

D.O. - My Dear (매일의 고백)

D.O. - It’s Love

D.O. - Tell Me (What Is Love) (feat. Yoo Youngjin)

D.O. - Lost

D.O. - The View

D.O. - Bite

D.O. - Crying Out

D.O. - Don't Worry (feat. Jo Jung Suk)

D.O. - Small girl (feat. Lee Young Ji)

D.O. - For Life (English Version)

D.O. - Good Night (오늘에게)

D.O. - Wonder (기적)