Transmigrate to Ancient Times and Activate the Shock System

The protagonist, Shen Yi, transmigrates to the transition from the late Yuan to the early Ming and unexpectedly becomes an ordinary refugee. Now a lowly peasant, he activates the [Modern Weapons System]. According to the System, he must do something that leaves people “astonished” to obtain energy, which he can use to unlock and purchase weapons. His first use of a modern weapon, a pistol, shocks the bandits in a small village. Shen Yi puts modern weapons to use, including high-powered crossbows and modern medical supplies.

Shen Yi tests his abilities by using modern gunpowder to make a simple bomb that drives back the Yuan army's vanguard.