I'm Clearly a Genius, So Why Is the Empress Making Me Live Off Her?

He's obviously a genius, so surely that has nothing to do with me, the protagonist, right?

Once a peerless prodigy, he became a good-for-nothing after a serious illness. Then the empress took a liking to him.

Protagonist: “I'm a genius! I want to roam the martial world and make a name for myself!”

The aloof empress: “...Stop running around and finish enjoying your easy life first.”

With help from a certain unreliable old man, the protagonist gradually grew stronger at a dizzying pace, while the empress slowly revealed why she had agreed to marry him...