Modern office worker Gu Chang'an won hundreds of millions in the lottery and subsequently suffered a car accident, transmigrating into the heir of the fallen Prince of Northern Suppressing Mansion in the Great Dasheng dynasty, bound to a death-return system where only being killed by enemies allows a return to modern times. Intent on dying and searching everywhere for assassins, he is instead automatically protected by the system, accidentally achieving military exploits time and again and rising rapidly in rank. Along the way, he meets the intelligent and resolute Shen Zhiwei and the loyal, brave guard Huo Qingshan, gradually uncovering the truth of how his father, the Prince of Northern Suppressing, was framed by treacherous officials in the imperial court. Entangled in a prince's coup, Gu Chang'an's state of mind quietly undergoes a transformation. When the opportunity to return to modern times is laid before him, he abandons his hundreds of millions in wealth, choosing to stay in this world to clear his father's name and protect his homeland, country, and true love.