D.O's song Tell Me What Is Love is beautiful absolutely stunning. He performed it in EXO's first world tour. Many people say that another person has written the lyrics but I feel like the lyrics have a strong influence on Mary j and a few other American songs. With that said I strongly think that D.O himself has written the lyrics to this song. It's beautiful I can't wait till he releases it to public, I wouldn't even be surprised if he went solo!!!!!!!!!! Watch out, D.O's coming!!!!!!