SBS's new medical series, "Sign", enlisted the cameo appearances of Hallyu idol group Supernova for its first three episodes. But that's not all. After recording the song, "The Day of Separation" for the drama's OST, the boys also participated in its MV shoot. Fans of both the drama and the group will see clips from the drama, as well as production cuts from the recording studio. Though the full MV hasn't dropped yet, you can catch a preview down below!