kid with goggles from christmas story

She was a cute and tomboyish girl attending a prestigious national university in the 21st century. However, little did anyone know that she was actually a secret agent groomed by a certain organization since childhood. She was about to face her graduation exams when she returned from a mission. But during a break, she dozed off on her desk and unexpectedly discovered that she had transmigrated to an ancient era. Not only did she lose her delicate appearance and the modern high-tech advancements, but she also became a discarded woman of low status! Surprisingly, she embraced this new life and said it suited her perfectly. From then on, the so-called demure girl cultivated the land and occasionally dealt with annoying troublemakers. She proclaimed, "Life is boring, but encountering troublemakers is great." The male lead said, "We have our fair share of troublemakers in my household. Coincidentally, my son lacks a mother. Would the young lady be willing to join my family and live together?"