Can a Cannon Fodder Simp Become a Mary Sue Harem Queen?

Apologies for changing the premise. The original blurb had been sitting around too long, and I couldn't write it anymore. Lin Li transmigrates, and the System tells her to play a cannon-fodder simp in a melodramatic romance novel. Lin Li: A cannon-fodder simp? System: You spend years secretly in love with Male Lead 1, Male Lead 2, and Male Lead 3. Then you catch them pinning the heroine against a wall and kissing her, so you leave in heartbreak. You're a background onlooker and witness to the beautiful love between the leads. System: We're short-staffed, so you'll need to wear several hats. Keep fawning over a few of them at once. Work hard, be careful, and don't mess up. Lin Li, a hardcore pretty-face lover and a level-ten otome game fan, lights up: A simp?! Now that's something I know! Whenever she can't keep fawning over them and wants to kick those pretentious guys to death, she just looks at their gorgeous paper-doll faces and gets right back to it. So she diligently clocks in and does her best to fawn. She finishes fawning over Male Lead 1 in the morning, then turns to Male Lead 2 in the afternoon. Once she's done with Male Lead 2, it's time for Male Lead 3 in the evening. _(:з"∠)_ She keeps bouncing back and forth between them, rushing from one to the next. She's busy. The male leads and supporting men: Indifferent, disdainful, unimpressed, smitten, vaguely alarmed, then completely losing it. Didn't you say you only loved me? How many dear big brothers do you have, anyway? The aloof senior disciple (with a cold expression): How many people have you said "I love you" to? The gentle, scheming Immortal Lord and Master (heartbroken): So I wasn't the only one. I suppose I was just fooling myself. The arrogant, brooding junior disciple (through gritted teeth): Lin Li, are you really so fickle? Do you have no heart at all? Theme: Keep your heart on the righteous path