I was leading and while game he give up.
use your replay when that happens instead of reporting a free win :P
honestly didn't know how to report that ;x it's a free win so i report it as, Next time i'll put replay and report as normal win.
Free win refers to a game that didn't get played at all and has no replay.
In your case, Your opponent left you in the game. So it had a half-replay to attach :)