Back From the Brink Season 1 Episode 3

The three reach a mutual agreement and visit the place where the dragon bone was sealed. The snake spirit opens the barrier with his spiritual power. Yanhui sees the formation of the barrier was unusual and starts to doubt Tianyao's identity, Tianyao tells her the truth. At the same time, Tianyao stabs her chest with his sword and finds that her blood can break the seal of the dragon bone.