South Korea clinched its first singles gold at the BWF world championships through An Se-young.
The Indian ace lost the semifinal 21-18, 13-21, 14-21 to the World No. 3.
Kidambi Srikanth is the lone India to enter the men's singles final at the Worlds.
Prannoy won his quarterfinals in three games against the fan favourite.
The Commonwealth Games bronze winners, who had received a bye in the first round, will face top seeds Chinese Chen Qing Chen and Jia Yi Fan in the next round.
Men's doubles pair Satwiksairaj Rankireddy and Chirag Shetty have also been awarded a first-round bye.
The two Indian men's doubles pair of Dhruv Kapila and M R Arjun and Satwiksairaj Rankireddy and Chirag Shetty also moved into the quarterfinals.
Ashwini Ponnappa and N Sikki Reddy progressed to the women's doubles second round.
The Kerala shuttler missed out on a bronze medal going down to eventual champion Loh Kean Yew of Singapore in the quarterfinals of the World Championships.
Srikanth went down to Loh Kean Yew of Singapore in the summit clash.