THE PROMISE

Qingcheng, a starving girl, wanders around the land in search of food. She chances upon a boy, tricks him, steals a mantou from him, and runs away. She encounters the goddess Manshen and accepts an offer to enjoy a wealthy and luxurious life and become the most beautiful woman in the land. However, she has a price to pay: She will never find everlasting and true love. She becomes the King's concubine when she grows up.

General Guangming defeats a large army of barbarians with only 3,000 soldiers and rushes back to save the King, who is besieged in the palace by the traitorous Duke Wuhuan. He meets Manshen, who tells him someone wearing his Crimson Armour will commit regicide and tarnish his reputation. A while later, Guangming is caught off guard and injured by Snow Wolf, Wuhuan's henchman, but is saved by his slave, Kunlun. He orders Kunlun to wear his crimson armour and save the King. When Kunlun asks his master how he can identify the King, Guangming tells him the King is the one without a weapon. Kunlun arrives at the palace and mistakes Qingcheng for the King because she is unarmed, and instead kills the King, who has just drawn his sword. He flees with Qingcheng, but they end up being cornered at a cliff by Wuhuan and his men. Wuhuan promises to not harm Qingcheng if Kunlun jumps off the cliff.

Kunlun jumps off the cliff but survives the fall. In the meantime, Guangming's subordinates accuse their General of killing the King and turn against him. Kunlun returns, saves his master and gives him back his Crimson Armour. They go to rescue Qingcheng from Wuhuan later. Qingcheng falls in love with Guangming after mistaking him for the person who jumped off the cliff. On the other hand, Kunlun is captured by Wuhuan, who realises he is actually the one who killed the King. While Guangming and Qingcheng lead a happy life in the countryside, Kunlun uses his speed power to see the Veil of Time and learns that Wuhuan is responsible for the destruction of his family and homeland. Snow Wolf is actually from the same land as Kunlun and was forced to become Wuhuan's servant. Snow Wolf also tells Kunlun that no one is capable of crossing over to the other side of the Veil of Time.

Wuhuan lures Guangming back to the palace and captures him. He then places Guangming, Kunlun and Qingcheng on a show trial for regicide. During the trial, Kunlun confesses that he killed the King, and Qingcheng realises he is actually the one who saved her earlier. Guangming, Kunlun and Qingcheng are sentenced to death but they break free and fight Wuhuan, who tells Qingcheng he is the boy she stole a mantou from. Both Wuhuan and Guangming die in the fight while Kunlun is fatally wounded. Kunlun survives after wearing Snow Wolf's immortality robe. Manshen appears when Kunlun and Qingcheng are attempting to pass through the Veil of Time, and tells Qingcheng that the promises made between deities and humans are as fragile as ordinary promises. Qingcheng has finally found her true love and thus given herself an opportunity to choose again. Manshen advises her to choose wisely. The film ends with the opening scene showing Qingcheng, as a little girl, wandering around.