The Last Locked Dragon Tomb

Twenty years ago, my grandfather disappeared mysteriously. Twenty years later, a patient carrying a coffin broke into my herbal medicine shop. What's even more bizarre is that an old man in black insisted on marrying his beautiful granddaughter to me. I was trapped in a mysterious realm and encountered a series of mysteries... Why did Dayu control the floods? Are there dragons in this world? What are the dragon-locking tombs across the country connected to? All of this starts with the dragon shadow in my left eye...