Looking at the various things the three sisters faced after time travel, the eldest sister Zhang Qin followed her father since she was a child because her parents divorced... She has a changeable personality and does not laugh easily in front of outsiders.
Jiang Xinyu, whose parents are divorced, has followed his father since he was a child, and has a gentler personality.
Li Ziyou has a good family but an impatient personality.
All three are violent