When Ji Muyun returned home for National Day, he learned that his father had adopted his best friend's daughter, giving him an older sister. She even went to the same school as him and was his senior. He was completely stunned.
Su Ruotang was just as surprised. After her father died, she had been taken in by his friend, and then learned she now had a younger brother.
As they spent more and more time together, feelings slowly grew between them, until Ji Muyun found himself completely under Su Ruotang's thumb.
