No one can understand Yan Yisui, just like no one believes where Cheng Jiran came from
Can a normal person be the antidote to mental illness?
Yan Yisui gave Cheng Jiran 99 wishes as money for her to buy medicine
"I want to leave something in this world. I want people to remember that I was here. Now I want you to love me, Cheng Jiran."
(Yan's thinking is different from that of normal people, please understand)
Concept: How to fall in love with a "psychopath"