When Ye Yan was ten years old, he came to his new home with his "father" whom he had never met before. In that medieval castle, he got the family affection he had always longed for. As time went by, he gradually discovered that there were some unknown secrets hidden in this ancient family. With a keen sense of danger, he left that home. But when he met them again more than ten years later, he had a completely different feeling than before...