I have an Apocalypse City - Chapter 21 - : Supermarket Membership

Mo Chou is the no.1 ranking female assassin in an illusive organization. One day on the way to the organization after completing a mission, she dies. She is shocked when reincarnates into her favorite novel but as a villainess who is the protagonist's step sister and dies a miserable death. She just wants to live a cushy and comfortable life so she decides to completely avoid the red flags aka the main characters and live like a saint (well a saint who is an assassin) But why does she keep stumbling into the main characters especially that infuriating villain and why the heck are they clinging onto her?

As an author who transmigrated into her own abusive novel, Shi Luo didn’t feel any pressure from it. Besides, it’s not like she transmigrated into the female protagonist who got abused physically and mentally anyway. And so she decided there was nothing she had to do, all she had to do was just to watch it unfold in front of her eyes.

But this development seems a bit wrong! Wasn’t this supposed to be an abusive novel? How unlucky!

- Description from Novelupdates

Humanity's end came without warning when a crimson fog swallowed the sky. Zhao, an ordinary man, watched in horror as a celestial voice declared their fate: their Planet had reached its limit, and its people would now atone for their sins. An otherworldly force crushed resistance, and in an instant, every human was teleported to the Central Land, a vast and hostile realm.The voice from the heavens promised trials that would shatter their wills, but also power beyond imagination for the fortunate. Only those blessed by luck would awaken unique Lord Talents, granting them the means to survive and dominate:In a world where strength lies supreme Zhao will do whatever it takes to get stronger.Zhao awoke in an isolated area near a forest. As despair set in, a voice echoed in his mind:Ding… Million Times Multiplier System has been activated.Just as the rest of the players had known of the world Zhou's subjects were clearing out every resource.When others were building their base he had built a kingdom.And by the time they knew of his threat, HE HAD ALRDY BECOME GOD!

agreed. He thought they might just talk, have a few drinks, and that nothing significant would happen. However, she invited him to a hotel, and they spent the night together.The next morning, she told him it was just a one-night stand and that they would probably never meet again. She said goodbye and left. Ronan also decided to treat it like that.The next day, at his college's hosting club, Ronan was given the responsibility of hosting that year's annual function, where they had invited a singer.When Ronan looked up at the singer, he was shocked—it was the same woman he had spent the night with. After checking her history and social media, he formed an impression of her. Every picture she posted was in revealing clothes, bikinis, or almost nude outfits.He concluded that she was just a promiscuous woman, likely driven by lust, and that she had probably chosen to spend the night with him simply because she found him handsome.Understanding this, Ronan decided to focus on his work. That morning, she had made it clear that it was just a one-night stand and nothing more. He would treat it exactly that way and carry out his responsibilities.Protagonist has System---No NTRIt's Harem, with many girls but The Singer is Main Heroine.