Ji Muyun, who was returning home for the National Day, learned that his father had adopted his friend's daughter and that he had an extra sister. This sister was in the same school as him and was his senior. He was a little confused for a moment.
Su Ruotang was also surprised. After her father passed away, she was taken in by her father's friend and learned that she had a younger brother.
The two gradually developed feelings as they got along again and again, until Ji Muyun was easily manipulated by Su Ruotang
