Though the agency did not reveal details for his leave, it did release an official announcement on MR.MR's fan cafe:
"Hello, this is Winning Insight M.
Unfortunately, we have sad news for our Misos who have always appreciated and loved MR.MR. We're truly sorry to announce this.
About 2 years and 4 months have now passed since MR.MR's debut, and during the time they've received a lot of love from everyone, a few sad things have happened.
Our youngest Ryu, who's received a lot of love until now, has ended his contract with the company due to inevitable reasons, and we have to sadly announce that he will be leaving the group. The reasons for ending the contract include differences in music and understanding others. We hope for your understanding."
The agency then stated that the remaining members and staff will give their all, apologized to fans, and asked them to watch over MR.MR.
Following the announcement, Ryu has taken to Twitter to make some complaints. The idol stated that he was "shocked" by the news of his leave and apologized to his fans. He claimed that the agency would threaten to sue him when he raised his concerns and he was physically abused by the staff. He claims that one time he was hit around his ear and bled and even lost consciousness. Although he asked them to reimburse his hospital treatment fee, they'd call him money-hungry and continue forcing him to carry on schedules and other matters he did not agree to. He also asserted that there were issues with his overseas contract in Japan.
Winning Insight M has yet to respond, and it seems MR.MR will continue on as four members for now. Ryu is the third member to leave MR.MR.