Pre-debut Preparation for the debut of the group has been three years in the making. About selecting the members for the first group signed under his R.A.I.N company,
Rain said, "There were a lot of factors involved in the process of making Ciipher, but when I met these kids, I felt like I could bet it all on them. Not just my time or my skill, but all the things I had and have made. Whether the group has good results or not, I don't think I'll regret the things that I gave to this group. That's how talented and well-mannered they are". Prior to joining the group, many of the members had auditioned on popular television programs or trained at other major labels. Keita and Dohwan were former contestants on YG's
Treasure Box, but they both did not make it into the show's final debut lineup. Won was a contestant on
Under Nineteen under his birth name Park Sung-won. He became a member of the debut lineup as he finished in 7th place. Won debuted as a member of
1the9 on April 13, 2019, and the group officially disbanded as a group on August 8, 2020. Hyunbin was a former contestant on
Produce X 101 under
Starship Entertainment, and was eliminated on episode 8, finishing in 32nd place.
2021: Debut with I Like You and Blind On December 12, 2020, Rain announced Ciipher would debut with their first
extended play I Like You on March 15, 2021. On September 28, 2021, Ciipher released their second extended play
Blind.
2022–present: The Code, Boys Planet and Fantasy Boys, Evnne and disbandment On May 11, 2022, Ciipher released their third extended play
The Code. Keita and Tag participated in Mnet's reality competition show
Boys Planet. and on February 20, 2023, Hyunbin became a contestant on
Fantasy Boys. On August 3, it was revealed that Keita will debut as a member of the project boy group
Evnne and on August 9, it was announced that members Tan, Tag, Dohwan, and Won had left the group. On October 10, Armada Ent announced the group's pre-debut tour entitled 2023 One Pact Fan on Tour "The Pact" in Japan and Thailand in November 2023. Both Evnne and One Pact were formed with members who were former
Boys Planet contestants. On December 8, 2025, Keita signed with Jellyfish Entertainment to continue with the group Evnne as a permanent group. Sometime around 2025, Ciipher's profile on R.A.I.N. Company's website was deleted. This has hinted that Ciipher has disbanded presumably. ==Members==