Lin Qiqi traveled through the book and became the vicious female supporting character who poisoned the male protagonist. She was also bound by the system and had to complete the task of poisoning the sickly prince Gu Shen. If she failed, she would start an embarrassing global love broadcast.
She carefully poisoned her, but unexpectedly discovered that Gu Shen could read minds and misinterpreted her poisoning as the ultimate love - poison is a love letter, poisoning is caring, and a double dose is deep love.
I thought I was just following the plot to complete the task, but Gu Shen knew she was poisoned and still willingly drank every bowl of poisoned porridge, being gentle and pampering to the extreme.
When the system tightens up and the plot gets out of control, Lin Qiqi is shocked to realize that she has already fallen in love with this yandere male protagonist who treats poison as honey, and his mind-reading and preference go in both directions from beginning to end.