Cynegetis impunctata (Linnaeus, 1767), a phytophagous lady beetle, was recorded in South Korea for the first time recently. Previously, only the adult form of this species had been described. In this study, we provide a redescription of the adult and the first descriptions of the larva and pupa. Diagnostic characters for this species are given, and intraspecific color variation in Cynegetis impunctata adults is discussed.