Eternal Verdant Art

Once the most humble spiritual field servant in the cultivation world, he accidentally gains the remnant soul of an ancient empress, and from then on, spiritual plants grow wildly and his aptitude becomes heaven-defying. However, the mysterious black book seems to seal more than just one beauty... The book seals the remnant soul of the first female lead, Empress Jiang Si. She mistakenly believes Shen Qingzhou is the reincarnation of the enemy who betrayed her, and wants to seize his body, but discovers that his soul carries the 'Eternal Verdant Dao Seed' she planted with her own hands. The two are forced to sign a symbiotic contract: she guides his cultivation, and he helps her recover her strength and rebuild her physical body. — Description from novelcodex.org