From the English KeSPA site: Proleague Penalty Points Calculation Standards: 2 [Cautions] = 1 [Warning] = 1 Penalty Point
According to KeSPA, so far in 11-12, there are 2 warnings, one happening on 11/29 and one on 12/17.
The first happens in this game between Crazy-Hydra and Killer. notice how Killer gg's at the end.
The second is for a reason I can't seem to figure out. Google translate leads me to believe it is something due to a delay of game, but I can't be sure.