My Senior Sister and Master are So Evil, I Was Forced to Cheat

[Invincible + Relaxed and Cool + Push All the Way] Traveled through time and became a disciple of the Demon Sect. I wanted to keep a low profile, but ended up being surrounded by evildoers. The eldest sister is a princess of the Demon Kingdom and inherits the Demon Emperor's legacy. The second senior sister is the daughter of Tiandu, who can poison an entire city with a wave of her hand. The third senior sister possesses the blood of the demon phoenix, and she can easily cause a nuclear war in the world. The junior sister is the reincarnation of the Ice Queen, who can freeze thousands of miles in the blink of an eye. The beautiful master was once a giant in the fairy world. In desperation, the protagonist had to awaken the cheat system and shouted: Come on...