Male Lead, Wake Up! I'm the Female Supporting Character

Su Qiuge transmigrates into a book as the younger sister of the villain. Not only is her villainous brother fed up with her, she has also offended his nemesis, the male lead, and is well on her way to courting death. After arriving, Su Qiuge plans to casually earn some goodwill and get the male lead, Xie Xinglin, to give up on taking revenge on her. She hopes to go from a cannon-fodder supporting character to an unremarkable passerby. Everything goes smoothly at first, until one day she notices that the usually aloof male lead is looking at her... in a rather terrifying way. Su Qiuge: ? Male lead, wake up! I'm a cannon-fodder supporting character! Su Yuanzhou can't stand his clingy younger sister. Later, he realizes that Su Qiuge has suddenly stopped following him around. Not long afterward, he catches his nemesis, Xie Xinglin, trapping his sister against the wall with both arms and saying in a low voice, "You don't need a useless brother like Su Yuanzhou. Whatever he can give you, I can give you too." Su Yuanzhou: ??? Theme: Treat the people around you well.