According to 'The Fact', Son Naeun decided to leave the group after the discussions between the members and both companies.

It is said that Naeun can no longer be with Apink due to her schedule problems and decided to leave ahead of their 11th anniversary.#손나은 @Apink_2011 pic.twitter.com/4rv4sL2KkO

— yeol 💫 closed. (@fiercelyapink_) April 8, 2022