Bai Lian Cheng Shen Episode 74

Luo Zheng, who is now a menial slave, used to be a young master of a big family. Owing to the decline of his family, his sister is imprisoned by a strong force, and he has no choice but to be at others' service. However, every cloud has a silver lining. The ancient book left by his father actually conceals a magical spell that can change a human into an instrument! What is the mysterious power behind this? This is a contest with fate.