There Will Always Be Protagonists With Delusions of Starting a Harem - Chapter 45

I dedicated 10 years of my life, focusing solely on regression.[Authority: Death Regression has naturally been nullified.

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. 

When Lin Chu met the ridiculously rich and affluent Yan Beicheng, she did not expect him to act like an immature hooligan, shameless in every way whenever they bumped into each other. Yet, every encounter had him come to her rescue, from saving her from the humiliation of watching her ex-boyfriend marrying her adopted sister, to whisking her away from petty colleagues and lecherous clients.Whether this is true kindness remains to be seen, as he never forgets to take advantage of her whenever he can. Is there something between them or is he just having fun with her?

- Description from Novelupdates

Hyde arrives in a doomed world with nothing but his body and fragmented knowledge of the future from a game he once played. He has no grand ambition—why try to save a world already destined to fall? Survival is enough.That is, until he discovers his sister is also transported into that world.However, only he hears the Melody of Nightingale and receives the power to survive.[You have established a connection with The Forgotten Hollow.]Awakening as a Resonant—an elite group with supernatural abilities—he is thrust into a conflict between two worlds. Armed with the authority of space and time, he vows to protect his powerless sister at all cost, even if he has to fight against the Mirage creatures, other Resonants, or even Gods themselves.