Originally, what interested her was the similarity in their lives.
Later, it was Ling Su's character.
Tong Yuanyuan never believed that there could be truly kind people in this world; it's all just a facade.
Just like herself, in everyone's eyes, she's the gentle and kind girl who can't stand any pitiful things.
But only she knows how much she loathes such a disguise: when she holds the hand of a beggar by the road, she feels utterly disgusted, yet she has to keep smiling; when she bathes those stray cats, all she thinks is how she wishes to drown those damned unruly beasts.
See, that's actually the kind of person she is, yet everyone sees the kind Tong Yuanyuan.
Because this kind of Tong Yuanyuan is likable to more people.
She feels that Ling Su is likely like herself, pretending to be kind and soft.
She slowly approached Ling Su, originally wanting to tear off her mask, to reveal her equally ugly inner self.
