Dragon Treasure

Fifteen years ago, the young man Bai Tian, with a broken arm, was adopted by the hunter family, the Bai family, and grew up together with his stepsister Bai Yu. However, there seemed to be a secret hidden in him. He learned mechanisms by himself, mastered yin yang theory and Eight-Trigrams, and even recast his broken arm.
One day, his stepsister, in debt from gambling, was hunted down by enemies. Both of them were forced to follow the creditor, Yuchi Ren, to break into the mysterious tomb for treasures to pay for her debt. The three of them found the clue to the Dragon Dungeon Coffin. When they were about to get the reward, they encountered a plague in the city, which caused the infected people to moult and become demonic monsters.
Fortunately, the rewarder of the ancient tomb told them that the Dragon Dungeon Coffin was related to the demonic monsters, and it could lead to the missing Tianji Sect and the treasures left by it. The rewarder hired the three of them with a great deal of money and found the Dragon Dungeon with the only clue: the demonic monsters. Following the horrible monster to their nest, all of them finally access the untraversed Tianji sacred land, but the real secret hidden in the Dragon Dungeon Coffin lets them realize that their horrific adventure has just begun...
(Source: Youku)