Chung, ranked 58 in the world became the first Korean to reach the quarterfinals of a major when he beat his idol, six-time Melbourne victor, 14 seed Novak Djokovic 7-6 (4), 7-5, 7-6 (3).
The 58th-ranked Chung relentlessly attacked a clearly injured Djokovic in a 7-6 (4), 7-5, 7-6 (3) fourth-round victory, becoming the first South Korean to reach the last eight at a Grand Slam.
The 30-year-old Serb wore a compression sleeve on his playing arm throughout the tournament, his first for six months, but after three relatively straightforward wins it was clear all was not well on Monday.
In his on-court interview after the game, Chung said of the win: "It feels wonderful, Djokovic was my idol".
Chung will face world No.97 Tennys Sandgren in the quarter-finals on Wednesday after the aptly-named American's shock defeat of Austrian fifth seed Dominic Thiem. After his earlier-than-usual finish, the 36-year-old world No2 said he might even be able to make the most of a night off and take his wife Mirka out for dinner.
"He just played, in the clutch moments, some really high-quality tennis". Chung has been the talk of the town notching up some impressive wins already at this years Open, but this 7-6 (4), 7-5, 7-6 (3) win over the Serbian is a class above the rest.
"When I'm young, I'm just trying to copy Novak because he's my idol", Chung said.
When he won the French Open in 2016, Djokovic was the first man since Rod Laver in 1969 to hold all four major singles titles.
"It was 2 hours, 20 minutes, straight-sets win, but I had to earn it", he said. Wow, this is hopefully real, you know.
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"I've got like a neighborhood, core neighborhood group, with my mom", said the Tennessee native.
Angelique Kerber came from a set and 5-4 down as she saw off Hsieh Su-wei 4-6 7-5 6-2 to reach the quarter-finals.
Djokovic received treatment at the end of the first set and grimaced his way through the rest of the match, and he must now decide what path he wishes to take.
Tomas Berdych reached the Australian Open quarterfinals for the seventh time after a 6-1, 6-4, 6-4 win over Fabio Fognini.
Halep, who last made it this far in 2015, said she had more confidence in her troublesome ankle that she rolled in her first-round match.
The six-time champion advanced with a clear-cut 6-2, 6-3, 6-3 win over Spanish 21st seed Albert Ramos-Vinolas in 2hr 21min on Margaret Court Arena. "I felt that now I can push the pedal and just go through the match", she said.
"We do play very similar", Djokovic continued.
The Taiwanese player took out one major victor - Wimbledon champion Garbine Muguruza - in the second round, and took the first set of Kerber. "This one was about as hard-fought as I've ever had a match before".
Four unforced errors, including a flimsy attempt at a drop shot at 15-30, allowed 2016 champion Kerber a break and some breathing space and the German finished the contest easily.