D.O. has finally released the full version and MV to his single "Tell Me (What Is Love)"!

D.O. really works his vocals in this slow, soulful R&B track (created by Yoo Young Jin), the perfect song to show off his color. 
 

This track sounds like it's meant to be a close cousin to EXO's "What Is Love," which was released four years ago, hence the term "epilogue."