Great Tang: I Gave My Life Back to You, So Why Are You Crying?

From the start, Li Chengqian is reborn and sets out to thoughtfully help his father, Li Shimin, achieve five great accomplishments. After he is rescued, Li Chengqian points a knife at Li Tai and tells Li Zhi that he is more fit to be crown prince than Li Tai. Finally, he tells Li Shimin, “Three months from now, after Mother’s death anniversary, I will leave Chang’an.” Over those three months, Li Chengqian becomes the biggest menace in Chang’an. Once he leaves Chang’an, he lets loose completely. Only then does Li Shimin realize that he has let a once-in-a-millennium emperor get away. Li Chengqian even makes it all the way to the Arctic Circle.