The Prince of the Joseon Dynasty, Kim Myungsoo, and Lee Sungyeol have been friends since they were young. The reason why they have been so close to each other is because of Sungyeol's father being the most known teacher at Seonggyungwan and Myungsoo's father the King. They grew together and their friendship grew. But when Sungyeol was a child, he became ill, and almost to the brink of death. Then a miracle happened and the next day he was a happy child, but the prince never genuinely smiled

The sun lights up the day, the moonlight gives a path in the darkness, and the stars watch over the people as they sleep. A boy who became blind due to an accident is stuck within the walls of the hospital. Then one day another boy comes into his room, and soon they become friends. For each other they become a part of each other's life to the point where they don't want to be apart. As times passes, one of them comes to realize that time may be against him. He uses those seconds, minutes, h