Sharing the System with an Archenemy

[Two male protagonists, the system, rivals, secretly in love with each other] There was a system failure, and my mortal enemy and I were forced to share the same strategy system. Novice task: block the opponent's knife once. Shen Yan sneered: "I would rather fail in the self-destruction mission." Jiang Yu raised his eyebrows: "What a coincidence, my dagger has already been aimed at your back." We are forced to defend each other from zombies in the doomsday world, and endure thunder for each other in the fairy world. Until one day the other party's memory fragments are unlocked—— Shen Yan saw Jiang Yu rummaging through all his social updates late at night. Jiang Yu discovered that Shen Yan had secretly taken high school photos of himself hidden in his wallet. The system prompt suddenly stopped: "Any... Mission change... Please host... Kiss immediately?"