Thirteen ranking points separated the two but Olympic bound Kashyap showed a lot of gumption during his 71-minute battle against the Korean before losing by 14-21 21-19 16-21 margin at the Siri fort stadium here.
Kashyap played long rallies and made some brilliant returns but he left enough opening for his rival to capitalise as the Korean lead 11-7 at the break. The Korean exploited the Indian's weakness and extended the lead to 18-11 before sealing it with a roaring smash from the mid-court.
In the second game, Wan once again opened up a narrow 4-1 lead. Kashyap tried to break Wan Ho's rhythm and caught up with the Korean at 10-10, much to the delight of the vociferous crowd and then surged ahead 18-16 with a couple of cross-court smashes.
The Korean clawed back at 18-18 but he faltered at the fag end as Kashyap closed the game at 21-19.
In the decider, Wan Ho committed some unforced errors early on to allow Kashyap to lead 5-2 but he drew parity at 7-7 and with Kashyap faltering at the net, the Korean lead 11-10 at the break.
After the change of ends, Wan Ho extended the lead to 15-11 before moving on to 18-12, courtesy unforced errors on Kashyap's part.
Kashyap did play a few splendid shots as well but in the end it was the Korean who had the last laugh.