I’m in Yongle-Era Ming, but the System Is in the Apocalypse?

A man in the Ming dynasty is reborn as Zhu Gaoxu and awakens a post-apocalyptic life System, but there seems to be something wrong with it.

He slaps his younger brother, but the System says he beat a giant apocalyptic bear and rewards him with a Red Hare steed?

He makes a suit of armor, but the System says he discovered an arms factory and rewards him with a Level 3 helmet and Level 3 armor?

He digs a tunnel, but the System says he found an abandoned factory and rewards him with the Physics Excalibur?

He collects a batch of grain, but the System says he raided a food factory and rewards him with ten thousand boxes of instant noodles?

Is the System actually living in a post-apocalyptic world teeming with monsters?!

Months later, when Zhu Yunwen sends a massive army to attack Beiping, they come up against a man riding a Red Hare, wearing Level 3 armor, with a riot shield in his left hand, rebar in his right, and the Physics Excalibur at his waist.

Leading his army, Zhu Gaoxu sweeps away all resistance, takes Nanjing, and ascends the throne!