Cheng and Chien stopped their second-seeded South Korean opponents in straight sets, 21-19, 21-8.
The Taiwanese women got off to a rocky start in the first set, falling behind 11-5, but seemed more comfortable together after taking a break. The fought back to tie the set at 19-19 before closing it out by taking the final two points.
Riding the momentum of their first set comeback, the Taiwanese duo coasted past the South Koreans in the second set to clinch the title.
Cheng and Chien won US$27,000 for their efforts at the US$300,000 tournament, which featured a total of 175 men and women from 21 countries.
The team from Denmark was the biggest winner in the competition, walking away with three of the tournament's five titles — in the men's singles, women's singles and men's doubles.
The host team of South Korea only managed to win the mixed doubles event.