Aiding My Queen With My System

Chu Feng transmigrates to a fantasy world only to realize that he’s a handsome but useless man who’s marrying into the family of Ji Rui, a capable woman of very high cultivation level. He quickly falls for his beautiful fiancee only to find out that she just wants to maintain a fake marriage to appease her powerful father, Ji Zheng. He finally finds himself in a situation that he would usually find in novels upon getting married—he is blessed with the Divine-level Son-in-law Freeloader System.
The irreverent system rewards him with mysterious gift packs and rare treasures for his efforts in completing missions, resulting in him quickly advancing from an ordinary person to a cultivator.
Ironically, Ji Zheng becomes more powerful due to a treasure Chu Feng receives from the system, which culminates in Ji Rui becoming the supreme leader of the four major sects in the world. However, opposing forces remain lurking in the shadows and Ji Zheng decides that a special treasure is required to aid Ji Rui in her ultimate advancement in cultivation.
In her search for this rare treasure, a stranger from afar comes with information of a cryptic ravine that splits the Purgatory Sea into two. She decides to follow the stranger and brings Chu Feng with her on the dangerous trip to the faraway Purgatory Sea which teems with itinerant cultivators, demonic beasts, and valuable treasures.
When they run into a life-threatening situation, Chu Feng says to Ji Rui, "My instinct is to protect you."
She is amazed with this man in front of her. Why would this weak and useless man want to save her when he knows that their marriage is only a sham? What should she do with this husband of hers? What would happen to their relationship when they find the special treasure?