The Indian challenge in the Korea Open Super Series Premier badminton tournament ended in Seoul today after Olympic bronze-medallist Saina Nehwal suffered a stunning quarterfinal loss to China's Li Han. The third-seeded Indian went down 14-21,21-15, 12-21 in a contest that lasted 59 minutes. It was quite an upset for Saina, who had beaten Han in their previous two encounters. Earlier, Parupalli Kashyap and P V Sindhu had exited in the second round yesterday.