Question: Between Jonah Matranga and Cho Kyuhyun, which singer has appeared on postage stamps?
Sentence (from "Cho Kyuhyun"): He is best known as a member of South Korean boy group Super Junior, its sub-groups Super Junior-K.R.Y., Super Junior-M and a former member of the South Korean ballad group S.M. the Ballad.
Relevant evidence: No