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Singer Ailee has sent a congratulatory message to Pledis trainees Joo Kyul-kyung and Im Na-young, who have been selected for the upcoming girl group IOI.

On April 2, Ailee posted profile photos of Joo Kyul-kyung and Im Na-young on her Instagram, and wrote, "My little sisters! Congratulations to Joo Kyul-kyung and Im Na-young."

She continued, "Although I supported them  quietly and was full of tears after seeing them after a long time, I was very proud of my little sisters. For the past five years, Na-young, Kyul-kyung, and Si-yeon have been always great. I've never forgotten our promise in the dorm and the practice room after confirming my debut that we will see each others on stage."

Ailee added, "I know that you never gave up and kept practicing very hard. So I'm very proud of you guys. I love you so much."

Meanwhile, the final 11 members to form the project girl group, IOI, from 'Produce 101' are Jeon So-mi (JYP), Kim Se-jeong (Jellyfish), Choi Yoo-jung (Fantagio), Kim Chung-ha (M&H), Kim So-hye (Redline), Joo Kyul-kyung (Pledis), Jung Chae-yeon (MBK), Kim Do-yeon (Fantagio), Kang Mi-na (Jellyfish), Im Na-young (Pledis), and Yu Yeonjung (Starship).