The Cannon-Fodder Beauty Conquers the Dragon-Proud-Heaven [Quick Transmigration]

(I've changed the premise, so feel free to remove it from your collection if it's not your thing!) Su Qing is bound to a quick transmigration System and plays cannon-fodder tools in worlds ruled by domineering protagonists. Sometimes he's the sidekick who cheers on the protagonist, and sometimes he's the expendable fool who keeps provoking him until he dies by the sword... [The Harem's Beautiful Sidekick] Su Qing diligently plays the part of a loyal sidekick and takes good care of the women being groomed for the protagonist's harem. But the protagonist's gaze grows increasingly strange. Su Qing: I get it. He's jealous because I'm too close to the women in his harem. He hastily puts some distance between them, and, sure enough, the protagonist's dark expression eases. The main plot progresses smoothly, but the harem plot gets stuck. Then, while exploring a secret realm and helping the protagonist through an aphrodisiac incense, Su Qing is the one who ends up being kept busy for several nights. Once they're out of the secret realm, Su Qing looks at the first harem girl, who was supposed to go through that plot with the protagonist, and ponders where things went wrong. As he watches her, a pair of hands covers his eyes. A low voice murmurs close to his ear, full of jealousy: Don't look at her. Look at me. [The Reborn Protagonist's Archenemy] Su Qing plays a peerless prodigy, always standing above the clouds and never once defeated. But after meeting the protagonist, he suffers setback after setback, growing ever more extreme. The protagonist becomes his inner demon. He opposes the protagonist at every turn and maliciously frames him, driving him into dire straits. At last, the protagonist can take no more and plunges his sword into Su Qing's dantian. Everything goes according to plan. Su Qing is finally about to finish the last part of the plot, and the protagonist plunges his sword into his... Wait? His clothes? "So desperate to win?" The protagonist smiles. "Fine. Call me big brother, and I'll let you be on top." [The Reborn Protagonist's Former 'Girlfriend'] Waiting for inspiration to strike... Theme: Different choices shape different personalities