Because Tan Chenxiao's wechat profile picture was of Lu Sichen, how could he not know about it.
The first conversation Lu Qichuan had with them was a month ago.
[ Angelica: Hello. ]
Angelica?
This was the name his daughter had given him.
[ astray: Hello. ].
Angelica: Your Wechat number is only one letter away from a very important person, so I found you.
Lost: the person who made you want to go back in time? ]
Tan Chenxiao was never a person who liked to communicate with others. What did she mean by going back in time?
Angelica: that's right.
Lost: then where is she now?
Angelica: too many things have happened between us. Perhaps she was really tired, so she left completely.
Lost: then are you still persisting?
Angelica: her leaving made me feel that my persistence was meaningless. ]