Xiao Qian knew that nobody is perfect, and there is no such thing as a perfect person in this world.
Just like that auntie from earlier, even though she was a bit petty and narrow-minded, she still had a simple side to her, always trying to sell her pickles and wholeheartedly advising Xiao Qian to make up with Yu Minglang.
This partially represented people's personalities; they might care about small profits but were also very kind-hearted. Xiao Qian understood why her teacher let Yu Minglang bring her here.
The purpose was to let her witness the life of this family; they had experienced almost every hardship imaginable, yet they were still alive.
The way to overcome fear is to realize that fearful things are not as terrible as imagined.
However, the teacher miscalculated this time.
Even an authority like Professor Liu could not see through Xiao Qian's dual life memories, and her fear of marriage was not based on an unknown future or overly high expectations for perfection.