Forgot the title

Ok, English is not my first language so sorry for the mistakes.

I forgot the name of the webtoon. It was bl or yaoi, not sure which one. It's a novel adaptation. And historical.

The MC was a duke, he was an idiot in his first life, and lost everything then he became a beggar met with saint then died. Then he regressed to the time before his castle was conquered and decided that this time he will help his people and make a deal with the commander. By the way the commander is the saint from the previous life.

Anyone knows the name?