"Whatta Man" (also known as "Whatta Man (Good Man)") is a song recorded by South Korean girl group project I.O.I. The song samples the 1963's song "What a Man" by Linda Lyndell. The song was released as a single album by the first sub-unit of the group, with members Nayoung, Chungha, Jieqiong, Sohye, Yoojung, Doyeon and Somi. It was released as a digital download by YMC Entertainment and distributed by LOEN Entertainment on August 9, 2016 and as a physical single on August 11. The lyrics were written by Nikki Flores, Phillip Bentley, and Seo Jeonga and the music was composed by Emile Ghantous, Steve Daly, Keith Hetrick, Ryan S. Jhun, Michel Schulz, and Fritz Michallik, with additional background vocals from Nikki Flores and Melanie Fontana. To promote the single album, I.O.I's unit performed the song on several South Korean music programs, including M Countdown and Music Bank. A music video for the title track was also released on August 9.

The single album was a commercial success peaking at number 2 on the Gaon Digital Chart and on the Gaon Album Chart, for its digital (downloads and streaming) and physical sales respectively. It has sold over 64,922 physical copies and 368,469 digital downloads as of September 2016. The single album sold 69,076 physical copies in 2016.

On May 27, 2016, YMC Entertainment revealed the upcoming I.O.I's promotions plans, stating that the group will be starting solo and unit group promotions in the summer with no further details. On June 4 more information about the unit was released. YMC stated "We are in the final stage of deciding on the unit group members. We will announce the unit group members on the official site this week." Later, on June 7 it was revealed that a release was expected to late July or the first week of August and that I.O.I's members Yoo Yeonjung, Jung Chaeyeon, Kim Sejeong and Kang Mina will not be part of the unit. It was also stated that the first creative process begun, choosing songs as the potential title track. On June 9 it was officially announced that the unit will be composed of seven members: Kim Doyeon, Kim Sohye, Kim Chungha, Lim Nayoung, Jeon Somi, Zhou Jieqiong and Choi Yoojung. It was also stated that member Yoo Yeonjung will return to her agency to continue her training process. On June 24 the agency officially announced that the song will be release on August, stating “They are [IOI's unit] engrossed in lessons and choreography practice. There is a lot of time for them to rest in between practice. Because we don’t have the two main vocals, the members are putting a lot of effort into their singing practice as well."

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