At the time of their disbandment, the group consisted of six members: Chunjin, Eunsu, Kim Kookheon, Shin Junseop, Song Yuvin, and Hanseul.

He later signed The Music Works[2] and debuted as a soloist with releasing digital single "To The Bone It's You" featuring BtoB's Minhyuk on May 30, 2016.

[3] Later that month, The Music Works also announced that Song Yuvin would debut with an upcoming boy group in the first half of 2017 named MYTEEN.

[5] The Music Works later introduced seven members: Lee Taevin, Chunjin, Eunsu, Kim Kookheon, Shin Junseop, Hanseul with Song Yuvin on Baek Ji-young's nationwide concert Andante in Busan on August 27 with performed their upcoming track "Amazing" (어마어마하게).

[10][11] In January 2017, they held their first international fan meeting at Hong Kong[12] and had their first reality show Trainee Escape Project - Myteen Go!

[21] MYTEEN released their second EP F;UZZLE on July 10, 2018, with a total of seven tracks including the lead single "She Bad".