Khalifa: Queen in the Apocalypse - Chapter 211: Voyeur (R-18)

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

I really just want to lose money! T_T

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

To everyone in the Full Moon Pack, Hailee Stones was just an omega, the quiet daughter of the pack house cook. No one ever guessed she was more than that. As an omega, she was often overlooked, belittled, and disrespected, especially by Nathan, the Alpha’s son. He always singled her out, teasing and tormenting her in ways she couldn’t understand. Why did he bother to notice someone like her at all?Everything began to change when Callum, the Alpha heir of the Nightshade Pack, transferred to Moonridge Academy to finish his final year. The school was located in Full Moon Pack territory, and Hailee was surprisingly chosen to be his guide.But they weren’t the only ones to cross paths. Nathan's cousin, Dane, the charming and mysterious Beta heir of the Snowmoon Pack, known for always getting what he wanted, also took a sudden interest in her. Dane, who had never glanced twice at an omega before, seemed drawn to the fiery girl who refused to bow her head.Things escalated quickly.Soon, all three young heirs, Nathan, Callum, and Dane, were fighting for her attention. The tension between them grew unbearable, and Hailee was caught in the middle, torn and confused by her feelings for each of them.Then, just a week before her eighteenth birthday, everything changed.Hailee slept with all three of them… on the very same day.And the very next morning, she vanished without a trace.Ten years later, Hailee returned to the Full Moon Pack. But she wasn’t alone.She came back with three boys, triplets, each bearing a startling resemblance to one of the men she had left behind.Now Nathan, Callum, and Dane each claim that at least one of the boys is their son, if not all three.As for Hailee? She has no idea who the true father or fathers are.