"Cactus" (Hangul: 선인장; RR: seon-injang) is the debut single by South Korean boy group A.C.E.

It was released on May 23, 2017, by Beat Interactive and distributed by Sony Music.

[1][2] The group held their debut stage on SBS MTV's The Show on May 23, 2017, performing the single.

[3] They continued on MBC Music's Show Champion on May 24, Mnet's M Countdown on May 25, KBS's Music Bank on May 26, MBC's Show!

[7] A 15-seconds music video teaser was revealed on May 21, 2017, through their official YouTube channel.