As a patient with multiple personalities, Fang Yiyan, who looks cold-blooded and ruthless on the surface, actually hides a weak and kind-hearted second personality. Devils and angels coexist and appear alternately. Unknown human rights think that Fang Yiyan is crazy.
And Lu Shinian, in Fang Yiyan's words, is just a medicine, "heart medicine"
As for the story of Fang Yiyan and Lu Shinian, it is so simple that it can be described in one sentence - "There will be angels who will love you for me."
Only Fang Yiyan's second personality, Gu Xiaonan, can think of Mary Sue's lines like this.