Qi Tuan finally got rid of his family's control and went to a high school in a neighboring city.
School just started. Someone recognized him as a sister.
By coincidence, he actually has a sister. But if a sister is not a friend, a younger brother is disrespectful. That's why he is most annoyed when someone calls him "brother"
Some years later…
He saw her calling someone else's brother repeatedly, but he panicked!
Concept: ignorant age, throbbing emotions.