That's why Nangong Beiying hoped that those who were kind to her could be happy, only then could they continue to live happily ever after.
As for Qing Teng, she was clearer about some things than anyone else, which was why she never demanded anything. For those who had been kind to her, even if they wanted her life, she would not harm them. Nangong Beiying was one such person who had shown her kindness. Therefore, even though Qing Teng knew that An Xiaofeng was in love with Nangong Beiying, she would not speak out and make things difficult for everyone.
This was why Qing Teng made Nangong Beiying worry for her. Sometimes Qing Teng might seem too ruthless, but she would never hurt her own people, not in the slightest.