Yess, " i don't remember" on soojin's text statment only explicitly written on her first statement about the juice.
But according to the news about the meeting with the sisters, soojin's allegedly said or act "i don't remember" when confronted by the sister, but still it's not clear is it true or not and which part that soojin's doesn't remember about the accusations on that meeting.
Then seo shin ae, soojin's called out shin ae said that doesn't do any harm or even ever talk to shin ae and asking shin ae to address the issue.
Then, shin ae on her statments tells about what soojin's alegedlly forget about:
She says she does not remember and has never spoken with me, and that is true. They were just one-sided insults. I think it is unfortunate that she is drawing the line even saying that she definitely did not do the actions or say the scornful words in her group behind me. And I’m not sure what kind of witnesses or evidence she has, but I want to ask if her selective memory is honesty that can cover up everything I am talking about.
on the last sentence, i think shin ae tried to called out soojin about her selective memory.
Imo, these events above are how "i dont remember" tied with this case.
Since no more statements from soojin and cube and since it's revealed that cube doing lawsuit which there is also no further explanation about either the lawsuit goes to the sisters and also to shin ae...then we only could wait and see.