The bespectacled 21-year-old, conqueror of six-times Australian Open victor Novak Djokovic, suffered from blisters on his foot before retiring from the match while trailing 6-1 5-2 against 19-times grand slam champion Roger Federer.
His performance against Chung was brutally clinical as he outclassed the 21-year-old for an hour before the Korean threw in the towel.
Chung was bidding to become just the third Asian player to reach a grand slam final after former Australian Open champion Li Na and Kei Nishikori, and he had shown, particularly with his victory over Novak Djokovic in the fourth round, that he possesses the game to trouble the best.
Hyeon Chung wasn't on Twitter before he began his historic run at the Australian Open, becoming the first Korean player, male or female, to reach the semifinals of a Grand Slam.
Federer is chasing a 20th major title and a joint-record sixth at Melbourne Park, while Cilic hopes to lift his second Slam in his first final in Australia.
'We saw it against Rafa, we saw it last night again against Edmund, he brings the power, he brings basically everything, ' he said after beating Chung.
Cilic made a major breakthrough by winning the 2014 US Open, a moment that Federer believes changed his mentality.
The Swiss great had an unimpeded march into Sunday's final against Marin Cilic with an abrupt-ending semi-final against South Korean young gun Chung Hyeon on Friday. Over the last few days, it was blister under blister under blister.
It was "red raw" he told reporters, and pain killing injections had provided no relief.
Woods faces opening test at Torey Pines
But he was back at one-over after a bogey at the par-five 13th, where he was in the right rough off the tee. Woods was on the South Course at Torrey Pines, which has been kind to him throughout his career.
"He [Chung] has a great composure and I think we're going to see a lot more for him".
"From the return, moving, forehand, backhand, serving, I think everything is in a good, solid spot". Because he [Chung] has played so many matches in the row, I think that's why it was a build-up.
You'd hope that with the finals next up the network has heard the voices of tennis fans and won't miss any more games due to excessive advertising.
"'It's like worse than regular blisters", Duguid said. "I can't finish the match, so I can't play anymore", he said. On this kind of a court you have to play aggressive - both him and me. "Things must be all right if I haven't dropped a set and in the final".
Ominously, Federer added: "I'm just pleased that actually my game has been good from the very beginning of the tournament so far".
Eyeing a 20th grand slam title, Federer is expected to win Sunday's final on Rod Laver Arena.
The end came even sooner than expected, though, as Chung took a medical timeout at 4-1 down and then called it quits at 30-30 and 5-2 down in the second set. The thought process is not like, 'What would have been better?' I'm just happy I'm in the finals. "I'm just really happy", he said.
"I make first round 16, quarters and semis".
"He is already a great player but we are talking about next-level excellence and I think he's going to achieve that", Federer said.