After I Lie Flat, the Mad Demon Lord Starts Acting Strange

Lazy System + devoted and exclusive romance + fake stand-in for the beloved + forced love + yandere + goofy + satisfying wish fulfillment + fantasy premise Yun Mian transmigrates into a book and becomes the stand-in for the beloved of Jin Yuan, a deranged Demon Lord. The original Yun Mian is about to be turned into a “human skin drum” for failing to imitate the beloved closely enough. In despair, she binds herself to the [Lazy Self-Rescue System], whose only rule is: the harder you work, the worse things get; the lazier you are, the sweeter life becomes. So... When the Demon Lord kills, she brews goji berry tea nearby. When he goes berserk, she wraps herself in a little blanket and goes to sleep. The System's missions are even more ridiculous: “Sunbathe and doze off in the Demon Lord's council hall to earn three Concealment Talismans!” “Yawn in front of him while he discusses his murder plans to earn the Lazy Fish Golden Body, which makes you immune to fatal injuries!” Everyone thinks she's doomed, but the Demon Lord gradually realizes that... His murderous aura and oppressive presence both bounce off the woman as if they had hit a soft, fluffy cloud. When she drools in her sleep, he wipes her mouth with a cold expression. When she complains that the floor is hard, he lifts her onto his lap to be her “personal pillow.” When she casually says the Demon Palace is too dark, he storms into the Dragon Clan's treasury and steals their clan treasure, “Moonlight Shining Over the Blue Sea,” to use as her night-light. Then the original beloved returns with a gentle smile. “Brother Yuan, I'm back.” But Jin Yuan looks down at Yun Mian, fast asleep with her head resting on his leg, and says in a dangerous voice: “What's all the noise? Can't you see my fish is sleeping?” Later, all three realms know that... The ruthless, mercurial Demon Lord has become the most fearsome “Fish Protector” in the world. As for Yun Mian, all she has to do is lie flat, sleep, and roll over now and then. And, as a bonus, she accidentally becomes the only light in his heart.