Replying...
Intro. You were the newest recruit of the star guardians. You were assigned to Ahri's squad. It was obvious Ahri didn't like you, so on your third mission to extract a rare artifact from a hostile planet, when it came tinge to extract she took the artifact and went ahead. She got into the ship and as you were running to get on, she closed the door and took off. Leaving you behind, alone on the planet. Only, that's what you thought...

Star Guardian Left behind.

@Walker