This unused 2013 card seems like another case where something small went wrong.  The caption is only in Korean (거부 기) and while the agent describes this as “Caretta” (loggerhead turtle), the translation comes back as “Group rejected”.  We think the printers just forgot the last part of the name, because “loggerhead turtle” is actually “거북 거북”.   Anyway … the stamp is quite a large and round view of a menacing shark.  Grade: 1