You have to recall everything and uncover the truth in order to save the person you want to save.
Everyone around her has secrets, and it's okay. As long as she doesn't know or pretends not to know, she can be a happy salted fish. Zhu Qingying thought so.
So when she was forced to accept the secret and unlock it, she absolutely refused. She escaped the first time by elopement (not), but reality hit her again and again, leaving her to peel off the cocoons and state the truth.
Purpose: Live and die together