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On May 3, AOA attended the '25th Yeoncheon Jeonggok-ri Paleolithic Festival' as the guest performer. Unfortunately, Seolhyun and ChoA were not present and only the remaining 5 members (Jimin, Yuna, Hyejeong, Mina, and Chanmi) went on stage. 

Fans were already aware that Seolhyun was unable to join since she's currently in France for ad filming. However, the reason behind ChoA's absence is unknown. FNC Entertainment has not provided any explanations. 

Furthermore, the link to ChoA's Instagram has been deleted under AOA's profile on portal site Naver. 

ChoA has also been inactive on Instagram for 14 weeks. Fellow AOA members' Instagram activities are also raising suspicion about the well-being of the group. On May 4, Yuna shared a screenshot of the lyrics to IU's ''Ending Scene'' which stated, "I sincerely wish it. You have the right to be happier."

Mina also shared a message via Instagram that read, "Hold on tight. It'll pass."

The last time ChoA participated in AOA's schedules was back on March 11 for the group's concert. She did not attend AOA's schedule in Japan on April 1 and has been away from social media and public events ever since.

Concerned fans commented, "I can't believe their agency hasn't said anything about this", "It's not AOA without ChoA", "I remember how she cried during 'My Little Television'. She must be having a difficult time..", "This is fishy;; Is she the second member to leave the team after Youkyung?"