The title refers to an energy drink proffered by an aging prostitute, played with exquisite restraint by Youn Yuhjung, originally known in South Korea for her femme fatale roles and more recently for over-the-top comic matriarchs.

The film is a quietly stylish, cheerfully nonjudgmental look at a society that is loaded with middle-class comforts—as represented by the tidy, peaceful parks where she plies her tired wares—but that has neglected to roll out the safety needed to support older people who don’t have families at hand. The subject sounds grim, but the movie is a mellow parade of small, human-scaled delights mixed with the offhandedly macabre.