C415 My Boyfriend Wants a Deep French Kiss
After Zhou Cancan and Duan Jiarui reconciled, Zhou Cancan gave him a new nickname, Coach Duan.
There were two reasons why she called him coach.
One was that night when they made up, Duan Jiarui said he was a coach.
The other was that while Zhou Cancan was training, Duan Jiarui was indeed a coach for her.
So after that night, Zhou Cancan began to call him "Coach Duan