You're not the only one, so no shame in that .I stand corrected.
For the record, however, Coaches Shin and Ryu are the ones who laid the foundations for Yuna's jump technique and skating skills. Many would argue that Yuna had pretty much already recognizably become "YUNA" in those critical and signature aspects, thanks to these coaches, before she even got to Brian Orser to receive the (also critical) final polish.