Traveling Through the Tang Dynasty, the Starting System Entrusts Dreams

I, Bai You'an, came to Datang just after passing away from a heart attack at the age of twenty-five. The 'system' asked me to live to be a hundred years old. This task is very suitable for me! But why did I bump into Li Shimin and his wife before I even ran away? Why adopt me? What is the prophecy left by the immortal in his dream? … When my personal obsessions and the fetters of real family ties were placed in front of me, I had already made a choice. And you, the mastermind of the truth behind the 'system' and the 'immortal', where will your obsession because of me go in the end? … After the struggle of two lives, the hope of this third life is just around the corner. Can the tragedies and regrets of history be completely rewritten? How should we write this new history?