Senior Sister Is Going Crazy

I am weak, pitiful and helpless, alone with my sister. My sister was bullied, but by chance, I was accepted as a disciple by the ancient battlefield master. I was originally ready to kill everyone, but I didn't expect that I was still a weak chicken, and I had to rely on my senior sister to rescue me. The seemingly harmless senior sister did not expect to turn out to be a murderous demon without batting an eye. Senior sister, please save me, Lin Bingluo yyds! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.