N.Flying Lee Seung Hyub Lends Vocals For K-Drama 'Tomorrow' OST By Staff Reporter Apr 02, 2022 slide 2 of 6 Photo: News1 Photo: Lee Seung Hyub Instagram Photo: Lee Seung Hyub Instagram Photo: Lee Seung Hyub Instagram Photo: Lee Seung Hyub Instagram N.Flying Lee Seung Hyub sings "Red Light," K-drama "Tomorrow" OST. Stream it here.