Kashyap, who is on a comeback trail after recovering his fitness following a long injury lay-off, defeated sixth seed Jin 18-21 21-8 21-16 in a nearly one-hour men's singles contest of the USD 120,000 event here.
The London Olympics quarter-finalist will face Korean top seed Son Wan Ho in the semifinals.
Kashyap blew a 9-5 and 11-8 lead at one stage to allow Jin make a comeback and draw parity at 11-11. The Korean then managed to move ahead to a 19-14 lead. The Indian did narrow down the gap to 18-19 but could not stop Jin from pocketing the opening game.
In the decider, Jin changed his gears and zoomed to a 9-3 lead but Kashyap showed tremendous grit as he crafted his way back to draw level at 11-11 and grab a 13-11 lead.
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Kashyap said he was happy to have beaten a player who had reached the Australian Open Super Series finals earlier this year.
The shuttler from Hyderabad said that he decided to play more rallies in the second and third games and the strategy worked for him.
"I could play fast paced rallies, the conditions were suitable to me. I could play my strokes. He has got a good defence and so I decided to play more rallies in the second and third game and it worked.
"Tomorrow it would be a tough match. We have played a few times and I have beaten him (Korea's top seed Son Wan Ho) twice, so hope to do well. I am feeling good about my rhythm in this event. I prepared well for this," said Kashyap.