[PAR] [TLE] I.O.I [SEP] I.O.I (; also known as IOI or Ideal of Idol) was a South Korean girl group formed by CJ E&M through the 2016 reality show "Produce 101" on Mnet.  The group was composed of eleven members chosen from a pool of 101 trainees from various entertainment companies: Lim Na-young, Kim Chung-ha, Kim Se-jeong, Jung Chae-yeon, Zhou Jieqiong, Kim So-hye, Yu Yeon-jung, Choi Yoo-jung, Kang Mi-na, Kim Do-yeon and Jeon So-mi.  They debuted on May 4, 2016 with the EP "Chrysalis" and actively promoted as a whole and as a sub-unit for less than a year. [PAR] [TLE] Jung Chae-yeon [SEP] Jung Chae-yeon (born December 1, 1997), better known by the mononym Chaeyeon, is a South Korean singer and actress.  She is best known for being a member of the South Korean girl group DIA, and for finishing 7th in the survival show "Produce 101", making her a member of I.O.I.
[PAR] [TLE] I.O.I [ SEP ] I.O.I (; also known as IOI or Ideal of Idol ) was a South Korean girl group formed by CJ E&M through the 2016 reality show " Produce 101 " on Mnet . The group was composed of eleven members chosen from a pool of 101 trainees from various entertainment companies : Lim Na - young , Kim Chung - ha , Kim Se - jeong , Jung Chae - yeon , Zhou Jieqiong , Kim So - hye , Yu Yeon - jung , Choi Yoo - jung , Kang Mi - na , Kim Do - yeon and Jeon So - mi . They debuted on May 4 , 2016 with the EP " Chrysalis " and actively promoted as a whole and as a sub - unit for less than a year . [PAR] [TLE] Jung Chae - yeon [ SEP ] Jung Chae - yeon ( born December 1 , 1997 ) , better known by the mononym Chaeyeon , is a South Korean singer and actress . She is best known for being a member of the South Korean girl group DIA , and for finishing 7th in the survival show " Produce 101 " , making her a member of I.O.I.
Which South Korean singer/actress was a member of both DIA and I.O.I?
Which South Korean singer / actress was a member of both DIA and I.O.I ?
Jung Chae-yeon
Jung Chae-yeon