[2] After working at Pan Entertainment, she used her family name to create an agency with a name similar to it to produce Park Seon-ju's 4th album.

On April 7, 2017, Kim Dong-han and Jang Dae-hyeon participated in the Mnet's survival variety show Produce 101 season 2, in which they ranked in the 29th and 83rd place.

On November 3, 2018, trainees Yoo Yong-ha and Kim Jun-seo took part in MBC TV's variety show Under Nineteen, through which they ended up being in the final lineup and they officially debuted in 1THE9 on April 13, 2019, After 17 months of activities, they disbanded in August 2020.

[5] From May to July 2019, Kim Yo-han participated in the Mnet's survival variety show Produce X 101 and finished in first place.

The group was supposed to last for 5 years, but they disbanded on January 6, 2020 due to the Mnet voting manipulation scandal.