What Am I Afraid of When the Northern Barbarians Invade? Buy Arms in Space-Time Supermarket

[Rebirth of ancient times + items available for purchase after completing supermarket missions + modern weapons to beat primitive people + single female protagonist + dark-hearted comedy + mindless and cool writing, readers should be careful] Yan Chengyi: "I have no soldiers and horses, no food and grass, and no military expenses to recruit soldiers and horses. You want me to go to the border, fight against the northern barbarians, expel the aliens, and protect the country?!" What is the difference between resisting the 400,000 Northern Barbarian army with bare hands and having Ba Bolben eliminate the four masters and disciples of Tang Monk? Just when Yan Chengyi was about to lay waste and wait for death, he suddenly awakened the golden finger [Time and Space Supermarket]. As long as he completed four supermarket tasks, he could open the shopping function, and he could buy even AK, Laifu, and Gatling. Yan Chengyi was ecstatically preparing to complete the supermarket tasks, but unexpectedly, each task became more outrageous than the last.