MY.st

st uploaded a picture on their Instagram account, tagged "coming soon". Nearly two weeks later, on February 28, MYstar Entertainment shared with the press that the group plans to debut in March. The same day, it was posted a teaser photo for their debut releaase on their social media.

On the midnight of March 12, the group's debut schedule was released. Their debut mini album, The Glow : Eden, was released on March 26, 2020. On February 24, 2021, MYstar announcement via a comeback schedule that MY.

st would release their first single album, "The Glow : Illusion", on March 16. On July 10, Lee Minho revealed on Instagram that he had left the group. On July 17, 2021, Kim Keonwoo revealed through his Instagram account that the group had disbanded due various reasons including their agency's financial and credit problems.

He revealed that many of the agency's employees, hair and makeup staff, stylists, choreographers, composers, and dorm owner hadn't received any money from MYstar Entertainment. When Keonwoo told the agency he wanted to quit, MYstar explained they would only terminate the contract if he returned all the money they spent for the group. The group also did not had proper lessons due to moving practice rooms every time, and had improper accommodations including rent being pushed, using cold water in the winter, gas being cut off, and being kicked out.

As a result, Keonwoo developed severe depression, bipolar disorder, medical problems, and has to go to a psychiatrist every week to receive medication and psychotherapy.