All:

I believe Mr. Soper is correct almost to the letter.  However, technically, the match is not over until the Referee acknowledges one player over the other.  In this instance, while there was a 7-pt. gap, I believe that we, as referees have also been given the admonishment that if a player is up by 6, has a kyongo, scores the 7th point and immediately commits an infraction that violates the "spirit of fair play", that we should give that second kyongo, and with that, the score would return to a 6 point spread, and the game would continue.

In this case, if we were to apply that thinking, it is conceivable that one could award a gamjeom to Chung, because of the coach's behavior., bringing the match back into play. If one were to stretch it even further, one could DQ Chung and award the match to Hung, under the "blatant disregard for the safety", etc., rule, where the referee can award the match by punitive declaration.  Again, only because the match ain't over until the referee say it's over.

Personally, what would I do?  Neither of those two.  I think I would go along the route Mr. Soper suggested. I would remember the admonition of WTF Ref Chairman Kim, when he said, "use your brains and your experience to apply the rules as guidelines to fair play."  In that light, after the pandemonium had subsided, I would declare Chung the winner. I would have the TA hold the credentials of Chung's coach, pending a ruling of the Sanctioning Board of the WTF on the coach's behavior.

...and I'd probably have a very tall, very stiff scotch at the bar that night...

--Larry Voorhees