Sisters, I Am Actually the Big Devil!

Shen Zihao's parents disappeared, leaving only three beautiful sisters to depend on each other. He is low-key, but he was assassinated. Instead, he got a blessing in disguise. He obtained the key to the secret realm. What others had worked hard to obtain, Shen Zihao had it at his fingertips! Panacea? Pull it with a car! Panacea? Use a pot! Kung Fu? Get the box! Hum hum, everyone thinks that the sisters are demons supporting their younger brothers. In fact, I am the real devil!