Plus Nine Boys (Korean: 아홉수 소년; RR: Ahobsu Sonyeon; lit. Boys Whose Ages End in Nine) is a 2014 South Korean television series starring Kim Young-kwang, Yook Sung-jae, Oh Jung-se and Choi Ro-woon. It aired on tvN from August 29 to October 11, 2014 on Fridays and Saturdays at 20:50 for 14 episodes.

The romantic comedy series is about four males who each confront different challenges in love and work at the cusp of a new decade in their lives.