Imperial Saint Sovereign - Chapter C576 Lord Ruler's Hall!

“Unlucky” would be the nice way to describe Lucas’ luck. He wasn’t just down bad. He was practically cursed.As someone who never asked to exist, he’s had to experience medical torture, imprisonment, and eventually death. And that was just his first life.Then, just as he thought of escaping his fate, he transmigrates into the body of the Empire’s most useless Flower Vase.Great, now he should have status, wealth, and beauty, right?Wrong.Because his new body, Young Lord Luca Kyros, was a vegetable. And what’s worse was that no one else seemed to know the truth. To everyone else, he was just your typical rebellious heir.He wouldn’t have minded that. He was used to being called a harlot or similar names for being a defective Guide. But the problem was he woke up right smack in the middle of the Royal Military Academy’s Assessment test.And his double body, the one who should be attending school, perished in an ambush.So now, he’s forced to resolve his existential crisis while attending a school he never even enrolled in.He’ll have to conquer his flimsy body, his brooding roommate, and his picky-eater “dungeon”—all that on top of surviving impending doom.Someone definitely needs a miracle.

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

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.