World No 13 Lu, the tournament’s No 7 seed, came through a hard-fought tussle 21-16, 20-22, 21-18 to lift his first trophy since the Canada Open in 2018.

World No 30 Lee was unseeded in Seoul.

China’s world No 1 Shi Yuqi was eliminated in the quarterfinals, while Denmark’s Viktor Axelsen, who won his second straight Olympic gold in Paris last month, did not compete.

In the women’s tournament, South Korea’s No 7 seed Kim Ga-eun won by walkover against second-seeded Chinese opponent Wang Zhiyi.

In the mixed doubles, Malaysia’s No 4 seeds Chen Tang Jie and Toh Ee Wei beat China’s unseeded Guo Xinwa and Li Qian 17-21, 21-13, 21-13.

Indonesia’s seventh-seeded Leo Rolly Carnando and Bagas Maulana upset South Korean top seeds Kang Min-hyuk and Seo Seung-jae in the men’s doubles final, winning 18-21, 21-9, 21-8.

In the women’s doubles, South Korea’s sixth-seeded Jeong Na-eun and Kim Hye-jeong beat Malaysian No 4 seeds Pearly Tan and M Thinaah 21-12, 21-11.