It will be screened in the A Window on Asian Cinema section, one of the most important at the festival to be held from October 21 to 30.
According to organizers, the section is a peek into styles and visions in cinemas across Asia, "highlighting the films of this year's most talented Asian filmmakers as well as the work of directors already established in the industry."
"Chi Chi Em Em", directed by Kathy Uyen, is about a rich talk show host, who offers a room in her opulent home to a young woman whom she knows through her show despite the opposition from her husband.
Thanh Hang (L) and Chi Pu in "Chi Chi Em Em". Photo courtesy of Muse Films.
It later forces her to face her darkest secrets and her husband's sin.
The movie hit Vietnamese cinemas in December 2019 and collected VND71 billion ($3.05 million).
Short film "Binh" will also be screened in Busan this year. The 22-minute movie, directed by Vietnamese independent film maker Ostin Fam, is about a meeting between an alien and people on Earth. It will be shown in the Asian Short Film section.
This year the festival, in its 25th year, will screen 192 films from 68 countries and territories, with several sections moved online because of the Covid-19 pandemic.
Last year Vietnam had 10 entries, one of which, "Rom", directed by Tran Thanh Huy, won the New Current Award given to the two best feature films selected from the first or second works of directors with a prize of $30,000 for each.