The Beloved Junior Sister Wields a Giant Hammer

Bai Ruo transmigrates into a book set in a cultivation world. She gets bound to a vicious female supporting character System. System: Your character is a delicate, scheming white lotus. Bai Ruo: Oh. System: Your task is to join the female lead's Kunshan Immortal Sect, cultivate immortal arts and spiritual power, and pick fights with the female lead all day. Bai Ruo: How exactly am I supposed to pick fights? System: Use the usual vicious supporting character tricks, framing and setting her up. The key is to cry pitifully and play the victim before anyone else can. Bai Ruo smacks the rock in front of her flat with one palm. "I can't cry, but I can beat people until they do." System: ... Bai Ruo: What did you say my character was again? System: Daddy. The new junior sister at the Floating Life Sword Sect is tiny and soft, as if a gust of wind might blow her away. Her senior brothers and master take pity on their delicate junior sister, and the whole sect fusses over her in every possible way. The new junior sister eats eighty bowls at her first meal. Senior brothers: The junior sister should eat more and grow big and strong. During a sparring match, the junior sister knocks the eldest senior brother to the ground within five moves. He lies there, pitiful, weak, and helpless, like a rag doll. Senior brothers: The eldest senior brother was obviously holding back to let the junior sister win. On the day the Demon Sect emerges, the junior sister knocks down every demon general who attacks the cultivation world, smashing them into demon paste. Senior brothers: T-the junior sister has certainly improved a lot over the years. The junior sister looks invincible as she levels a mountain with her bare hands. Senior brothers: ... The eldest senior brother gives a bitter smile. "I told you so." Having dealt with everything, the junior sister changes her tune. Her little face turns red as she drops her bloodstained warhammer, patters over to her master's arms, and speaks in a soft, sweet voice: "Master, I'm scared. Those demon cultivators were so scary." Senior brothers: ??? Demon cultivators: ???!!! Her master gently strokes the junior sister's head and holds her, soothing her. "Don't be afraid, Ruoruo. I'm here." Then he looks up. His sharp gaze sweeps over everyone, as if they were nothing but ants. "Now, who exactly made her cry?" The demon cultivators burst into tears: Demon Lord! Didn't you see that she was the one beating us up the whole time? Demon Lord! Weren't you going to overthrow the cultivation world and put the demon realm in charge of the world? Demon Lord! We're your loyal followers, really! Are you seriously going to attack us? Aaaaaah! The male lead is the Demon Lord, who wears the secret identity of a gentle immortal sovereign with a million layers of filters x the female lead, who seems soft and sweet but has astonishing strength and is naturally dark-hearted. "Once, I wanted to destroy this dull, corrupt world and create a new one that better suited my wishes." "But after meeting you, the world doesn't seem so boring anymore." "So I've changed my mind. I won't destroy the world." "As long as you stay by my side." Satisfying, sweet romance, mutual healing. Theme: Rather than having a powerful body, it's better to have a strong heart.