I Just Became Crown Prince, but the System Insists I'm a Tyrant Who'll Destroy the Nation

Zhao Xun transmigrates to the Great Qian Dynasty. His father is an emperor for the ages, the realm is at peace, and he is the crown prince, cherished by everyone. He has the perfect setup for a life of wealth and comfort, lying flat. Then he awakens the [Eternal Tyrant Life-Extension System]. The System arrived several centuries too early and mistakes Zhao Xun for the last ruler of Great Qian, a doomed emperor with rebels at the gates and everyone turning against him.

System: [The rebels have breached the imperial city! Mission: Find a sturdy hemp rope and hang yourself from a crooked tree on Coal Hill, preserving the emperor's last shred of dignity! Reward: Eighteen elite Yan Yun horsemen, three thousand Beiwei soldiers, and the might of a great emperor's unified army!]

Zhao Xun sits on a solid gold chair in the Eastern Palace and glances at the eunuch beside him.

"Go to the imperial garden, find a crooked tree, and bring me a red cord."

Zhao Xun holds the red cord up against the tree.

[Ding! The doomed emperor's final, stirring act! Facing death to be reborn! Reward: One hundred thousand cavalry delivered!]

Zhao Xun: ? Good grief, Father, with this army, your son could fight all the way to Europe!