What is the relationship between Cai Yi and Jiadi Zhao?

Cai Yi and Zhao Jiadi belong to the sister-brother relationship. Aunt Cai met Zhao Jiadi when she was working part-time. As the parents of students, Aunt Cai is really terrible. Although it looks gentle on the outside, it is the queen in the bones, and it is impossible to refuse, and the gas field is very strong. Later, Zhao Jiadi was shot twice to save Cai Yi.

Zhao Jiadi's first job after graduating from college was to be a tutor. He is responsible for teaching a very naughty student, that is, Cai Yi, the parent who knows the students here.

In the play, Cai Yi once told Zhao Jiadi that the fortune teller had calculated for him that she would wait for a man who jumped into the river by the river, and that was the only thrill. Unexpectedly, Zhao Jia jumped into the river directly after hearing this sentence. After being saved by Cai Yi, she was still laughing. This is obviously the mood of picking up girls after her success, so Zhao Jia's favorite woman is Cai Yi.