2016- MAMA Song of the Year: "Cheer Up" by Twice;
true Song of the Year: "Rough" by GFRIEND.
2017- MAMA Song of the Year: "Signal" by Twice;
true Song of the Year: "Some" by Bolbbalgan4 or "DNA" by BTS.
2018- MAMA Song of the Year: "What is Love?" by Twice;
true Song of the Year: "Bboom Bboom" by Momoland or "La Vie en Rose" by IZ*ONE.
2019- MAMA Song of the Year: "Boy wit Luv" by BTS;
true Song of the Year: "Falling Leaves Are Beautiful" by Heize.
2020- MAMA Song of the Year: "Dynamite" by BTS;
true Song of the Year: "Mago" by GFRIEND.
(I'm taking only title tracks into account)