Astro (Korean: 아스트로) is a South Korean boy band formed by Fantagio that debuted in 2016. The group is composed of six members: MJ, Jinjin, Cha Eun-woo, Moon Bin, Rocky and Yoon San-ha. They debuted with the single "Hide & Seek" from their debut EP Spring Up, and were subsequently named by Billboard as one of the best new K-pop groups of 2016.