The Bacchus Lady looks into the issue of elderly prostitution in South Korea. So-Young, an elderly lady who provides sex services to the male senior citizens using the pretext of selling Bacchus (an energy drink) to them. When So-Young picks up a Korean-Filipino boy named Min-Ho from the clinic she visits after Min-Ho's mother stabs the doctor (Min-Ho's father), she takes care of him while seeking a living through prostitution. From her interactions with her former clients, she finds that the golden age in their silver years may not be that bright after all.