Really surprised that the song being used in this drama is one from Michael Learns to Rock. At first while listening to the background music, I felt that the rhythm is really familiar, and later on realized that was because it is the sound of MLTR music.
Got to say that the OST is a winner and fit the kind of story HEALER has.
By Michael Learn To Rocks
OST 2 When You Hold Me Tight
by Yael Meyer
OST 3 What My Eyes Say
by Tei (테이)
OST 4 YOU
Ji Chang Wook and Park Min Young Kiss