Yoon - The Black Tortoise

(Project: The Post Office of Four Seasons) Yoon is a courier with exceptional skill in handling fragile packages. His outstanding talent has led him to be one of the mentors of the north. Rumors state that his apprentices either shine above all or give up on the first week. Knowledgeable and undoubtedly skilled, yet excessively strict, is what they say. Everyone besides Hyunho seems to be intimidated by him.