I think the plastic surgery theory is not out of logic. No way yg gonna let her go after her popularity. Didn't one of the member also dissappear for a month and coming back with a new nose? She might doing some big procedures with her body that cannot be hide. This is korea and entertainment company on top of that. Why people didnt think it make sense?
Perhaps because
- If they were to put her under PS, they must have done so right after the line up was completed so, the girl would have longer time to recover. But, she went missing several weeks after that.
- Regardless how badly her face swollen, she was supposed to frequent YG office to prepare for the debut, which could take place any time. Thus, fans must have spotted a girl in mask among Baemon girls. That was not the case.
- Also, she could have attended the concert with everyone masked.
- Other members must have been aware that fans are worried yet, they have never said anything on Ahyeon to assure fans. They could have said vaguely that she was recovering from "medical treatment" or she was not available at the moment due to "personal mater".