Transmigrated to an Ancient Famine, I Marry Two Princesses from Enemy States from the Start

[Ancient-era famine] + [Farming] + [Multiple heroines] + [System] + [Creative historical fantasy] Su Xiangheng transmigrates to the Great Qian Dynasty and becomes a poor scholar in Panlong Village.

Before he can even get his bearings, he is dragged off to choose a wife.

From a princess of a fallen kingdom, a celestial physician, and a former empress to the reigning empress, a wealthy young lady skilled in poetry and calligraphy, and the most celebrated beauty in the pleasure quarter... every one of them becomes a designated target.

One day, Su Xiangheng is left dumbfounded.

How has he somehow become invincible without even realizing it?