Name of Manhwa. Historical. Turning back in Time

Since mangago fucked my list i cant remember what manwhas I've marked as reading and im sad that i have found the title.

i think its under shounen ai since its not really explicit.

The mc is kinda gloomy and was killed on his first life since he devoted his 'loyalty' to the wrong person. And the person he admired the most was killed. There was something about a red stone on the first arc. I forgot the name but our mc has black hair he lived in a very isolated house/village and only came to the 'capital' for a test or smth. the ml has blonde hair i think he's a chief/commander rather than a crown prince.