What Bai Changyou can't stand the most right now is when people defend Cai Yiren's mother and her maternal uncle. When he came in, he didn't see them being overly intimate; after all, they are of age, and sometimes, emotional support is more important than other forms of consolation. However, the fact that these two had been meeting in this residential complex without his knowledge is undeniable!
Today just so happens to be the day when Cai Yiren was taken away by the police. Bai Changyou never cared about her fate; if she was taken away, he would only observe the situation to decide whether to cut ties or say a few good words on her behalf. With no other options, Cai Yiren's mother had to seek out her brother, the maternal uncle.