How Did a Frontier Poem Turn Me into a Barbarian Son-in-Law?

Jiang Mo transmigrated. The bad news: He landed straight in a life-or-death situation. The good news: After reciting a frontier poem, he accidentally caught the eye of a barbarian princess and became her husband on the grasslands. Good news, plus one: The System shop has everything, including modern weapons and food, available for purchase at any time. But all those supplies cost gold and silver... Jiang Mo: Where’s the most money? Let’s go rob the damn place! Heh heh heh!