Yandere Levelling in Her World - Chapter 7: Disaster of Guilds

Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.

When he got tangled in a fight with a few punks in this different world, he fell off a cliff and miraculously found himself still alive, with two more voices ringing inside his head. They were Sword Master and Saber Master. In the company of them, he continued to find out more about this whole new world. He took the sect entrance examination, entered the sect, met a strange man in black, and even participated in a major competition of the sect to have a chance to win over his peers!
In this whole new world, he was born again and got to explore the fantastic martial world!

- Description from Novelupdates

Six strangers met in a mysterious enclosed space.

One of them claimed to be a “senior” and stated that among the six of them, there was a “Devil” who did not bat an eye at killing. The biggest problem they now faced was how to avoid the “Devil” and escape from this world.

Mu Qin: I once had someone I really liked. He was very good to me, and always likes to dance in front of me with a knife. But one day, he went crazy.

- Description from Novelupdates

In her previous lifetime, they had married for five years. He meant everything to her, but she was thrown away like an old shoe.

Sheng Tang raised a little pup, both adorable and obedient, but lately its behavior seems to be a bit off.“Tangtang is so sweet.”“Tangtang's smile is so beautiful.”“Tangtang is the most talented woman in the world.”“Tangtang's acting skills are unmatched in the entertainment industry.”Sheng Tang: You've been feeding me all this sweet talk, what are you up to?Mr. Gu: Is being a fawning admirer really so suspicious?Sheng Tang: ...You really want to be a dog, does your family know? Have I, your wife, agreed to this?