In the fog of the old times, the young Lin Ye could always hear the low dragon language coming from behind the wall, until he accidentally touched an ancient pocket watch and was drawn into the secret world of the "Secret Covenant" - here there is not only a strange organization of extraordinary people like "The Lord of Secrets", but also the secret of a dragon that has been sleeping for thousands of years like "Dragon Clan".
The pocket watch awakened the dragon blood in his body, and also allowed him to form a contract with the silver-eyed girl Zero who had lost her memory. While avoiding the church hunters who were tracking the "Dragon Blooded One", the two of them solved the mystery of the Cthulhu runes in the pocket watch. However, they discovered on the way that the so-called "extraordinary power" actually originated from the dragon bones, and Zero's true identity was closely related to the ancient disaster that destroyed the dragon clan.
When the old rulers in the abyss are about to awaken, Lin Ye must choose between the obsession to protect Zero and the responsibility to save the world. This sincere bond across races will eventually become the last glimmer of light against the darkness.
