A woman studying folk tales of a vengeful ghost begins to suspect she and the spirit have something in common in this thriller. Yun-hee (Jo An) is a Korean writer who has been wrestling with a serious case of writer's block when she hears from a longtime friend, Seo-yeon (Cha Ye-ryeon). Seo-yeon has been living in Vietnam for several years and has become fascinated with a local legend concerning the death of a beautiful woman named Muoi. Yun-hee travels to Vietnam to help Seo-yeon with her research, and learns that over a century ago Muoi (Ahn Thu) was a beautiful woman who posed for an esteemed artist eager to paint her portrait. Muoi and the painter became lovers, which led to her violent death. Many years later, a handful of monks protect the painting of Muoi and warn people about her ghost, which is said to haunt the village of Dalat. The longer Yun-hee works with Seo-yeon in tracking down the secret of Muoi, the more she feels a strange kinship with the dead woman, and she begins to suspect Seo-yeon had a sinister purpose in bringing her to Dalat. Muoi: The Legend of a Portrait was the first official co-production between South Korean and Vietnamese filmmakers, though censors in Vietnam have prevented to release of the film in that country, wary of the story's supernatural elements.