Well the BBC said, that the clock was reset to 1s one time because of a technical infringement by the Korean (a fight cant end on an infringement).
I dont know, honestly i dont even care anymore. It might have been a bad decision, but it was the referees decision. There's always a little controversy when a referee has to make a judgement call that decides the match. I mean if the Korean had won you could've made exactly the same argument for the German.
I think all this controversy stems from the depresssing image of a crying Shin on the piste and that the vast majority of the TV watchers arent knowledgeable enough to judge wheter it was a good decision or not. Yes Heidemann is German and she profitted from the decision, but i'll take her judgement and those of the referees over people who simply cry unfair while they dont know anything about the rules or the standard practices of fencing.