The heroine is born with low intelligence. As the granddaughter of the patriarch, her material life is not bad, but her father has not cared about her mother since she was little, so she was secretly taught by her grandma. So a girl with a bit of dementia really slowly improved to almost normal under the alternative teaching that her grandma was exploring alone. However, it is slowly deviating from normal. So much so that the road ahead becomes unpredictable.