It's Not Easy Being Your Love Rival's Big Brother - Chapter 35

King Grey has unrivaled strength, wealth, and prestige in a world governed by martial ability. However, solitude lingers closely behind those with great power. Beneath the glamorous exterior of a powerful king lurks the shell of man, devoid of purpose and will. 

Reincarnated into a new world filled with magic and monsters, the king has a second chance to relive his life. Correcting the mistakes of his past will not be his only challenge, however. Underneath the peace and prosperity of the new world is an undercurrent threatening to destroy everything he has worked for, questioning his role and reason for being born again. 

In her previous life, she was humiliated and bullied every day. Her relatives despised her and her friends played tricks on her! Her mother and elder brother died one after another early. She gritted her teeth and survived the adversity alone, but only managed to live for twenty-six years!When she opens her eyes again, she finds herself back in time twenty years ago. To swallow insult and humiliation silently and let history repeat itself? If everything couldn't be changed, what was the point of her rebirth?! Who can stop her now that she defies her destiny and her abilities are emerging? In front of others, she is an ordinary student with an indifferent personality, isolated by her classmates. Behind their backs, she works step by step to build a brilliant and extraordinary business network.

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

Beatty, a weak squirrel shapeshifter who was born into a lion family. Because of that, I lived my life being ab*sed at my aunt’s house in the Capital. When I told my only friend and fiancé, the Second Prince, that I would leave to achieve my dream, ‘Ritter, you bastard…!’ I died on his fangs. I opened my eyes again to my childhood, the time before I got myself involved with the Second Prince. At times like this, what do you need? Speed. I immediately withdrew my body only and ran away to the territory of my biological father, the Lion Duke. Though I won’t be welcomed, if I possess this one great secret that will only be discovered in the future, I won’t get kicked ou— “Welcome, Young Miss!” “OMG! When did you grow up like this…?” “Young Miss is walking with those two cute feet!” … Huh? Why am I welcomed like this? No way, is that my statue?