This Young Master is not Cannon Fodder - Chapter 552: A Hundred Years

The celestial celestial beings who lived for more than 100,000 years were born and reborn in a small monk in a human world.
His motto: “It’s not as good as a medicinal medicine for ten years of hard work.” “Even if you practice a copper-iron bone, it’s not enough for my soldier’s attack.”

- Description from Novelupdates

Thea Lynch was seventeen when she injured her ear and temporarily lost her speech. Her parents passed away in a car accident, leaving her and her brother to rely on each other. Later, her brother was transferred for work and left, and she was taken to live at her grandmother's house in Westmere. During this period, her brother entrusted friends to check on her, and the one who visited most frequently was the “Third Brother”—Ian Preston, who was five years older than her.Coronet is over a hundred kilometers away from Westmere, yet he insisted on accompanying her to see doctors, patiently teaching her how to speak, and even appearing at her school gate every evening. He saved all of his gentle caring for her, but everything stopped abruptly before she could muster the courage to confess. Her secret crush was unsuccessful, and a sudden change at home caused her to leave, cutting off all contact with him.When they met again, it was seven years later when she returned home for a matchmaking date and was cornered by him in the restaurant corridor, “That guy downstairs, is he your date? How come after spending several years abroad, your taste has gotten so much worse? With better options around, how can you choose him?”“Who is the better option?” she instinctively asked.Ian Preston: “Me.”[Childhood sweethearts, getting back together, mutual unrequited love]

After dying, you wake up and realize you've been reincarnated as a background character who is judged as human trash.The decision to change your destiny comes instantly.Discovering that your identity isn't as simple as you thought, you feel favored by the heavens when you manage to become a powerful character.Katase: You won't fool me. I'll expose you for the pervert you are.Murayama: ...Thank you for saving us.Issei: Motohama, what happened to you? How are you so powerful?Rias: If you join my peerage, I wouldn't mind being yours.Sona: You beat me in the game. That means you're now my fiancé.Yasaka: Honey, Kuno wants a little brother.Kaori Houjou: Shinji-kun, let's go on an adventure.Kaede Kazama: Shinji-kun, thank you for saving me from that ball.Rie Sawada: Shinji-kun, I'll wait for you. You'll be my future husband, fufufufu...Changing known history and taking it in a direction not even his eyes could perceive, he didn't stop no matter what. Not even the other world was safe from his clutches.Lexia Von Arselia: My hero, and my future husband...Shinji advances without stopping.“I, Shinji Motohama, swear here and now that I will reach the top of both worlds.”

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.