I Coexist with the Devil in a Mutually Beneficial Symbiosis

"Can you hear about the symbiosis of living beings in the world?" "Biological symbiosis? Broadly speaking, symbiosis can be divided into three categories: mutualism, partial symbiosis, and parasitism." "Now that you know the pros and cons, would you be willing to form a symbiotic contract with a female devil?" "???" ———— Mu Heng traveled through the Nanhua Realm and became a humble handyman disciple of the Yunlu Sect. I just wanted to live peacefully in troubled times, but unexpectedly awakened the most precious treasure [Illustration of Life and Life], which can form a symbiotic contract with all the spirits in the world. Just when he was hesitating about what kind of living being to form a contract with, a fellow disciple brought the sad news that his old friend had passed away. The old friend left a message before his death, entrusting him to take care of his adopted sister. But Mu Heng never expected that the beautiful adopted sister would actually be a female devil. [The Illustration of Life and Life triggers itself, forming a symbiotic bond with the demon woman] [Current bond level: Lv1, contract type: parasitism, the other party can continuously absorb your longevity] [Sacrifice a hundred years of life to increase the level of symbiotic bond] "Am I the one who co-wrote the life sucked?!" However, as the bond gradually advances, the contractual relationship also changes: [Bond Level 1: Parasitism] [Bond Level 2: Mutual Benefit] [Bond Level 3: Mutual benefit and symbiosis, mutual cultivation, one person improves his cultivation, and the other person benefits simultaneously] [Bond Level 4: Mutual Benefit and Symbiosis, Sharing of Magical Powers...]