A three-term parliamentarian and former governor of South Chungcheong Province, Lee was confirmed by the National Assembly as Prime Minister on 16 February 2015.
Üç dönem milletvekili ve Güney Chungcheong Eyaleti eski valisi olan Lee, 16 Şubat 2015 tarihinde Başbakan olarak Meclis tarafından teyit edilmiştir.