Embers of the Apocalypse

Zhou Zheng, who was framed and his whole family died in his previous life, unexpectedly walked on the battlefield of another world, escaped nuclear bombs and slashed alien beasts, and became a small lord on one side of the dynasty's power struggle. What exactly is the mechanism on the chest? Should we save more people or stay alone? See how the protagonist gains a foothold in the cruel dynastic rule, and writes an epic legend while resisting invasion and fighting for power.