Three Kingdoms: Li Shimin's soul is reincarnated as A Dou!

The strongest carbon-based life form of the 7th century, the Great Khan of the Tang Dynasty, Emperor Taizong, has transmigrated!! This is the Shu Han state after the Battle of Yiling during the late Han Dynasty and the Three Kingdoms period! And his current identity is Liu Adou, the Crown Prince of Shu Han… “Restore the Han Dynasty and return to the old capital.” “If Emperor Guangwu of Han could do it, why can’t I?” “Moreover… the eldest son of the legitimate wife, this time I am the rightful eldest son of the legitimate wife!” Li Shimin couldn’t suppress the corners of his mouth. In his previous life, it was because he wasn’t the eldest son of the legitimate wife that he caused that mess at Xuanwu Gate! No one understands the value of being the eldest son of the legitimate wife better than him!!! More importantly! At present, he has just suffered a defeat at Yiling—he entrusted his son to someone at Baidi City, and his old father is also about to die… Although he still has two younger brothers, compared with a humanoid creature like Li Yuanji, they are truly kind and loyal. All obstacles… no, there are no obstacles at all! The start of this life is something he never dared to dream of in his previous life… Sigh! A howling wind dispersed the morning mist of Sichuan. The young crown prince's eyes held no trace of confusion, only the sharp edge of the Heavenly Khan! Years later, "Liang, I can no longer lead troops to quell the rebellion… Oh, cruel Heaven, why have you treated me so cruelly?" "Prime Minister, with me, Li Shimin, in this life, you will surely witness the unification of the Han Dynasty!!"