It was the second major success for the 19-year-old rising star five days after winning a historic gold in the mixed team event.
The two-time world junior champion thus made amends for his loss in the final to Lakshya Sen of India in the championships 12 months ago in Jakarta.
The teenager, however, has to recover quickly for the Toyota Thailand Open, which starts at Hua Mark Indoor Stadium in Bangkok on Tuesday. He plays the first qualifying match against Soong Joo Ven of Malaysia.