What's Wrong with Dressing up as a Demon Cultivator and Raising a Heroine?

[16+, Two female protagonists, partial to group portraits, cultivating immortals, slightly earthy, the female protagonist has no pt attack and reception] Qian Yu, the student council president who likes to complain but looks aloof, was killed by a romance novel about cultivating immortals, so she traveled through time and became a demon cultivator of the same name in the world of cultivating immortals. She lived in a demon gate, picked up a girl with amnesia, and then embarked on the path of practicing cultivation, getting opportunities, and cultivating both good and evil... But no one told them that she was the heroine?