OnlyOneOf.

OnlyOneOf (온리원오브) is best described as a six-member group that consists of KB, Rie, Yoojung, Junji, Mill, and Nine. Another profile detail is that they made their debut as 7 members with “Time Leap” and “Savanna” on May 28, 2019, as 8D Creative’s (RSVP) first boy group. Love departed the group in August 2021. The profile also notes that on August 8, 2025 KB confirmed that he has left the company and is currently independent. Another profile detail is that on October 30, 2025, 8D Entertainment stated that the group’s contracts had expired and that the company would no longer manage them. Additional background says that in a series of messages sent on Fromm, Mill stated that OnlyOneOf had not ended and encouraged fans to look forward to his future activities.