The three ancient clans of Longfang, Gaoxin, and Dituo have the ability to live forever. Their ancestors, the Youling clan, once formed an alliance with humans and defeated the Xuanfeng clan, another immortal race, and helped the human Shaodian clan to win the world. From then on, the three clans abide by the alliance, hide behind others, and share the same respect with the royal family. They do not worship the emperor when they see him. During the period of Emperor Wu of the Han Dynasty, the remnants of the Xuanfeng clan transformed into "ancestral dragons" and passed down the "blood covenant", hoping to return to the world. However, the situation of the three clans was not good at this time. The Dituo clan declined and their bloodline was lost. The other two clans split into two factions. One party betrayed the covenant and appeared in the human world on the northern grassland. The Zhuri Xiongnu clan, passed down from generation to generation, wanted to use the power of the "Ancestral Dragon Blood Pact" to seize control of the Central Plains and become the only king in the world; the rest of the Gaoxin and Longfang clansmen, under the leadership of Lord Ling'an, the leader of the Longfang clan, followed the ancient covenant and helped the Han in the north to stop the Zhuri Xiongnu clan from going south. The immortality of the three clans is related to blood. The Zhuri clan betrayed the covenant, and under the influence of the evil power of the ancestral dragon, they maintained their immortality by sucking human blood and gained extraordinary power. The remaining three clans on Ling'an Jun's side are protected by the covenant. They have both strength and immortality without the need to drink human blood, but they cannot violate the blood ring, otherwise they will be invaded by the power of the ancestral dragon and become blood-sucking demons. Our story unfolds in this context.
Concept: The forbidden love between man and vampire