A new interspecific hybrid cultivar, Wongam, was developed as a high-yield licorice from a Glycyrrhiza glabra×G. uralensis (G. korshinski Grig.) cross by the herbal crop team at the National Institute of Horticultural and Herbal Science, Rural Development Administration, Korea. The plant type is erect, and the leaf shape is oval. It has well-developed vascular bundles compared to G. uralensis as a control species. The dried root weight of ‘Wongam’ was 54.6 g per plant, and 22.7 g per plant in the control species G. uralensis. In addition, the average yield of ‘Wongam’ was 359 kg/10a, which was 127% higher than that of G. uralensis. It exhibits resistance to brown spot disease, as well as a to lodging. The glycyrrhizin and liquiritigenin content of ‘Wongam’ are 3.96% and 0.8%, respectively, which meets the Korean Pharmacopoeia Standards. This cultivar can widely adapt to most cultivation zones found in Korea, except for the Gangwon-do Province region (Registration No. 196).