What Should I Do If I Become the Villain's Senior Sister?

[The heroine who is dedicated to cultivating immortality and looking for her return to the living world➕The villain male protagonist who cultivates both immortality and demonism➕The original green tea heroine] By chance, Qingyan slipped into the book and became a passerby, the female sidekick Qing Shijin. Under the arrangement of her father Qingcai, she joined the Qinglan Sect and became the apprentice of the number one swordsman. Unexpectedly, the male protagonist Sikong Zhenchen, who would become the Demon King in the future, turned out to be her junior disciple. Qing Shijin originally wanted to get along with each other peacefully, but she didn't expect that during the process of getting along, she truly regarded the male villain as a family member. In order to prevent him from taking the path of the original novel, Qing Shijin had to bring him and the heroine Chu Yaoyao together. Who would have thought that he would actually tell me that he likes me? But it seems that I only have the same feelings for him as I would for a relative...