IM was a 4 member boy group who debuted with their first digital single album "Sad Story" on September 1, 2017. The single was released under Yama&Hotchicks Entertainment.
In October 2017, the group entered as contestants on KBS2's idol rebboting show The Unit, representing MBK Entertainment. Kijung had placed 8th which made him a member of the project group UNB.
In 2019, Hangyul participated in Mnet's boy group survival show Produce X 101, representing MBK. He finished in 7th place, making him a member of X1 with an exclusive 2-and-a-half years contract with the group. However, the group disbanded on January 6, 2020 due to controversy over the show.
IM quietly disbanded some time in 2019.