On the 14th of December, HO Company released a statement on BIGFLO's Dam Café regarding the upcoming expiration of contracts from the group's last two original members: Ron and HighTop. In the statement, it was revealed that their contracts will expire in January of 2019 and that the 22nd of December Japan concert they have planned will be the last event the group will perform as a whole. The event the group had scheduled in Korea in January will still proceed, and it's after this event the company will release more information on the future plans of Ron and HighTop.

Ron (Cheon Byeonghwa) and HighTop (Im Hyuntae) made their debut with BIGFLO in 2014 under Hyeyoom Entertainment. In 2017, they were joined by Sungmin, Euijin (most known from The Unit/UNB) and Lex.