Valkyrie Smash - Chapter 300 Let me try again.

Bai Fan was a Chinese medical university student who woke up as a Japanese high school student named Kitagawa Tera about half a month ago.It was just like a typical starting point in a novel. He re-experienced life as a high school student in his twenties. Youthful, energetic girls, and colorful love comedies…That should have been the original plot…However, heaven was obviously playing a joke on Bai Fan as he had not inherited any memories of the original Kitagawa Tera.Follow the level-headed and cold Kitagawa Teru as he navigated around his new world with the ‘System’ that constantly gave him supernatural quests to clear.

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

Qin Tian accidentally transmigrated into a sickly body, a body with broken Dantian that was unable to practice Qigong, in another world. Fortunately, God had mercy on him by giving him a level up system. Useless? That was him in the past. Not worrying about practicing Qigong, he was now able to kill Monsters to level up. Easy! Level up when killing Monsters; level up when killing people. An unbeatable sovereign of the clan in the eyes of other people, but in his eyes, he is a glittering big BOSS.