What is the secret of a young man who has been wearing a mask since childhood, a family that was destroyed by a change in royal power, a prince who restrained his sharp edges, and a woman who sticks to her bookstore? What is the connection between these things and people? When facing an old friend, how should a long-lost wanderer treat each other? When facing someone who lives by his own identity, will the real son regain his identity? Where is the will that can subvert the government's situation...