The Devil's Cursed Witch - Chapter 442 God Of War

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

He was always accommodating her in every possible way before they started dating.After they started dating, she couldn’t help but ask: “Do you like me a lot?”His gaze was intense, and without hesitation, he said: “Mm, I like you a lot.”She was stunned, looking at him and was lost for a moment. It took her a while to react, and she casually asked again—“Uh... so before, did you and your girlfriends...”“I've never had a girlfriend,” he interrupted. “Su Wan, before meeting you, I never intended to fall in love.”...This is the story of a cool and elegant violinist making a high-profile declaration of love to a shy, beautiful man.Warm, quirky, sweet but not cloying.

In order to chase down and kill her own murderer, Xia Yichu reached an agreement with the 233 system, and she will travel through the world to complete the task, and The 233 system helped her return to the original world.
However, Xia Yichu often encountered a broken BOSS while he was on his way to do the task. He did n’t agree with each other on the wall, the bed, the various patterns, and kept talking.
System: Please use one word to describe the other person’s impression in your heart.
Xia Yichu: Competent.
Shen Jiaye: Mine.

- Description from 69shu

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.