I Became a Fallen Kingdom's Princess, Emptied the Treasury, and Went into Exile

The strongest female agent of the modern age has transmigrated into a pitiful princess whose country has fallen and family been destroyed!? Her prince consort father rebelled, the entire imperial clan was wiped out, and her ungrateful husband and two-faced best friend joined forces to mock her as a foolish idiot!? After being stabbed in the back, she has to go into exile for a thousand miles with the few favored consorts left in her harem and her young brother!? No problem. With a pocket dimension full of supplies, she empties the imperial treasury and the traitors' homes, steals the imperial seal, and eats and drinks like royalty all along the road into exile! Once she reaches the wilderness, she builds a fortune and raises children, turning the barren land into a paradise! But why has the hostage prince from the neighboring kingdom, whose betrothal was once broken off, shamelessly followed her all this way? What? He's frail and needs to be adopted? Help, she doesn't want to! What is she supposed to do?