There are 2 translations for the post, please read both so you can have a better understanding.
source for twitter
She wrote, "When I was in my early to mid-20s, all I did was work. As a result, the only friends I had were my group members. When I quit my group promotions and stopped working with the members, everyone felt that it wasn't the same as before, and I felt a great loss amidst my loneliness. It felt like I had lost all my friends, at once."
She continued, "You may not believe it, but I felt like I was left alone in the world. It was a time when my own melancholy had completely engulfed me, so I think I felt more alone. For some reason, because there were still active members at the time, I thought I shouldn't communicate with the fans separately."
Lee Sem further wrote, "I don't receive anything special just because I do that performance once. It's not like I'm going to continue with my girl group activity." Here, Lee Sem revealed that she doesn't have plans to continue her girl group activities. She then apologized at the end of her post by writing, "In our earlier direct messages, I was too sharp and we fought together, but now I understand...P.S. And I'm sorry. I shouldn't have expressed my negative emotions like that. Something was blocking my eyes. Be well. To, Moon [Hyuna]."
I already share my feelings on my platforms but I just feel so bad for Lee Sem and what she went through . I always want her to know we always trust and believe in her like the rest of the members.