The Simple Life of Killing Demons - Chapter 10Book 3:

She is the underworld Ghost Doctor’s only disciple, who accidentally transmigrated into the body of the main wife’s daughter in the general’s mansion. She used to be a punching bag.Now, she stepped on her dregs of an older sister, put her father’s concubine in her place, and teaches any objectionable aristocratic ladies a lesson.

Her days are rather free and unfettered. But when did that cold as ice prince from the rumors, sporting a deadpan face all day long, fix his gaze on her?
He unexpectedly fawned and pandered to her like a devoted dog?

“Go away, you rotten man! Careful or I’ll needle you like a pin cushion!”

“Wife, why are you so fierce? As a husband, I’m so scared”
….the man is all smiles as he approached, his eyes gleaming with a cunning light.

- Description from Novelupdates

“How did you board the Astral Express, walk the Path of the Stars?”“Because I ended the Honkai, altered everyone's fate.”“So your first step on this path was becoming a hero?”“No, it was for survival, searching for a thigh to cling to.”“And then?”Ryan adjusted his glasses, his voice resounding.“I became the thigh.”

“Go Yohan, you really are a terrible bastard.”“I can’t help it. Bullying is more fun than being bullied.”Despite his outer appearance of a kind model student, Kang Jun was filled to the brim with an inferiority complex.As he advanced into his second year, he grew closer to Go Yohan, who was in the same class as him.“I’ll treat you especially different.”At some point, as if it were only natural, Go Yohan claimed his seat at the very summit of the pyramid inside the school.He, whose second nature seemed to be ignoring and suppressing others, showed interest in Kang Jun.Kang Jun, who was subtly ignored by his friends for being weak, didn’t dislike Go Yohan’s interest, but…Eighteen, the period where one’s pride took the lead and held fear of crossing the line.Kang Jun had to make a choice to survive.A very wise choice.

Roy died during a war against the Evil God Cult, but somehow, he returned back in time to 30 years in the past where he was just a boy who awaken his summoning magic.