on January 31, 2017. The group would still be actively promoting until the end of their contracts; including guest appearance on variety shows such as Immortal Songs: Singing the Legend, Yang and Nam Show and Knowing Bros. From January 20 to 22, 2017, I.O.I held their final concert titled Time Slip – I.O.I. The three-day concert was held in Jangchung Gymnasium, where the group held their debut showcase. On January 10, 2017, it was revealed that I.O.I had received songs from various producers and songwriters as potential songs for their final release, including B1A4's Jinyoung. On January 17, YMC Entertainment announced that the group's final track before official disbandment would be "Downpour", written and co-produced by Seventeen's Woozi. The ballad was personally chosen and recorded by all eleven members of the group. The digital single and its music video was released the next day at midnight. I.O.I's last schedule as a group was on January 25, 2017. They filmed a new CF for school uniform brand Elite along with boy group Pentagon. The band officially disbanded on January 29, with the members' last television show appearance on MBC's Section TV and the fan cafe closing down on the 31st. It was also announced on January 31 that I.O.I's song "Downpour" won Inkigayo'''s final January 2017 trophy with no live broadcast due to Lunar New Year's Day. Planned reunion On July 1, 2019, Studio Blu confirmed that the group would return in October 2019 with nine members, excluding Yoo Yeon-jung and Jeon So-mi. On September 6, the planned comeback was postponed to December. On October 29, the comeback was canceled due to scheduling conflicts between the members and the ongoing Mnet vote manipulation investigation. On May 4, 2021, the 5th anniversary of the group's debut, the group (except for Mina and Jieqiong) held a reunion livestream. Jieqiong managed to join the livestream via video calling. Members Lim Na-young () – leader Kim Chung-ha () Kim Se-jeong () Jung Chae-yeon () Zhou Jieqiong () Kim So-hye () Yoo Yeon-jung () Choi Yoo-jung () Kang Mi-na () Kim Do-yeon () Jeon So-mi () Sub-unit I.O.I sub-unit – Nayoung, Chungha, Jieqiong, Sohye, Yoojung, Doyeon and Somi Discography Extended plays Singles Promotional singles Soundtrack appearances Other charted songs Compilation appearances Videography Music videos Concert Time Slip – I.O.I (2017) Filmography Reality shows Produce 101 (2016) Standby I.O.I (2016) LAN Cable Friends I.O.I (2016) I Miss