My Apprentice Is a Mute Girl

Cao Yun accepted an apprentice. She is mute. She may also be a future demon giant. It is more likely that she will kill her master and betray her family one day in the future. Cao Yun knew all this, but he still didn't care. Because this girl will smile to herself, will stubbornly salute and greet her outside the door over and over again when she is resting, and will pick willow leaves and turn them into grass rings to wear on her head when the flowers are blooming in spring. If one day she still wants to kill him, then he only wants to say one thing to her before he dies: "I'm sorry." Note: It is a master-disciple development, there is no love, the protagonist is just an old father, no CP is formed. Strength division: [Skin] [Rooting] [Replacement of tendons] [Mallbone] [Body Casting] [Studio] [Guan Xin] [Leaping Gate] [Golden Pill] [Nascent Soul] [Seeking Truth] [Questioning Oneself] [Returning to the Way], [***] [***].