In phyline plant bugs, four genus each with one species are recognized new to Korea: Atractotomoidea castanea Yasunaga, 1999; Moissonia befui Yasunaga, 1999; Monosynamma bohemanni (Fallen, 1829) and Pseudophylus stundjuki (Kulik, 1973). Diagnosis and keys to species are provided with the clear dorsal images and the illustrations of male genitalia. Also the brief biology is discussed.