If anyone's interested, there's another sort-of BL film from Vietnam called Song Lang. Watch the trailer here: https://www.youtube.com/watch?v=APGUR9NhgrU
It got traditional culture (Vietnamese opera), 20th century Saigon aesthetics, 2 handsome men, and great cinematography. The only downside is the romance is not explicit, and there's a kill ur gay trope... But it's worth a watch for the culture alone.
Another highly recommended BL is Lost in Paradise, which is considered as Vietnam's first genuine BL, and the 1st piece of work that triggered the BL craze for the past 10 years. It also has a sequel but not many people like it. https://www.dailymotion.com/video/x5i5xoh