In 627, Li Yi's rebellion failed. The Eastern Turk Jieli Khan led an army of 100,000 people to attack the Tang Dynasty southward. Li Shimin was forced to sign the "Weishi River Alliance". In 627, Li Yi's rebellion failed. Li Shimin sent a special envoy. On the way, he saw a six-year-old boy named Li Kuan lying on the ground. He found a safety lock engraved with a golden dragon on the boy's neck, and took Li Kuan back to the home of a corps commander to rest...