After entering the DPRK, he was assigned to the Palace of Qin Dynasty, and Wan Che was assigned to the East Palace of Prince Li. When it was completed, Wanche was regarded as his right-hand man. Wu De and Wan Che were in the palace when the Xuanwu Gate incident happened in June. As soon as he heard that there was a war in Xuanwu Gate, he immediately led more than 2,000 palace soldiers to attack Xuanwu Gate, and at the same time clamored to attack Qin Gong. When they saw Yuanji's head, they immediately fled everywhere. Xue Wanche and led dozens of cavalry fled to Zhong Nanshan. After the situation subsided, Taizong sent several people to convey his intention and let him return to North Korea. Wan Che finally gave up his opposition and went to Korea with the messenger. Emperor Taizong believed that his victims were loyal, so he let bygones be bygones.
In the second year of Zhenguan, Xue was appointed as the primary supervisor of the temple. When Chai Shao led troops to Liang, which was divided in the north, he was appointed as the deputy general manager. Liang joined the Turkish offensive and defensive alliance at that time. Turkish reinforcements came from all directions when the officers and men traveled dozens of miles to the north. The government troops retreated slightly and stopped on a hillside. At this time, Xue and his brothers attacked from the left and right, beheaded their valiant soldiers and cut their military flags, and the Turkish soldiers panicked and collapsed. The loyalist took advantage of the situation to kill, and the Turks were killed and injured everywhere. The loyalist drummed again and surrounded the east of Shuofang where Liang was located. Soon, he was killed by his subordinate Liang and surrendered to the city. Turks have always been afraid to send troops to rescue.
In November of the third year of Zhenguan, Xue Wanche followed the Ministry of War to pacify the Turkic Li Jiehan and marched all the way to Saibei. After returning home, Xue Wanche was awarded the rank of Commander-in-Chief and the title of county magistrate for his outstanding military exploits. In the ninth year of Zhenguan, Excavate was ordered to attack Tuguhun, and Xue Wanche was invited to go with him. After entering the territory of Tuguhun, the generals led 100 cavalry. They suddenly met thousands of enemy troops, and Wanche told everyone to stop where they were. He rode alone to meet the enemy, killing left and right, and no one dared to stop the enemy. All the soldiers followed, waving swords, shouting and beheading thousands of times. After Xue Wanche War, people and horses were injured and bled. From the general manager of the army to the ordinary soldier, he is called the champion of the brave in the three services.
After Xue Wanche was transferred to the right-back general and Zhou Pu's secretariat, in November of the fifteenth year of Zhenguan, the Turkic Xue Yantuo led Uighur and 200,000 soldiers south to attack Morris, who had joined the Party. Emperor Taizong appointed Li Xun as the commander of Shuozhou Road March, Xue Wanche as the deputy commander, and led the troops to assist Morris. After meeting the enemy, Xue Wanche led hundreds of cavalry vanguard into battle, detoured to the enemy position, launched a surprise attack and scattered the enemy's horses. When the enemy saw it, it was too late, so the array collapsed. Xue Wanche attacked dozens of miles, beheaded more than 3,000 people and captured war horses15,000 horses. In the eighteenth year of Zhenguan, Wan Che married Princess Danyang, the daughter of Gao Zu, became a captain attached to the horse and a general in the right guard, and was promoted to a general in the right guard. Later, Pei, the deputy commander and right general, exposed his dissatisfaction with the imperial court, which in turn encouraged his wild thoughts. Gong Li in England believed that crimes could not be punished, so Emperor Taizong was dismissed and moved to a remote place. He returned to Beijing when he received an order to grant amnesty to the whole country.
In the second year of Yonghui, Xue Wanche was awarded the secretariat of Ningzhou. After entering the DPRK, he fell in love with the Sanda Room and was finally beheaded.