The Dragon King's Hated Bride - Chapter 24: Experiment

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

Reborn in a parallel world, Fang You landed on earth with the cry of a newborn!By achieving growth goals, he could unlock various unique talents, positioning himself to win right from the starting line!As a baby: Accomplish 1,000 rollover movements to unlock the talent “Reverse Life”;As a toddler: Master 10 paper airplane folding techniques to unlock the talent “Origami Celebrity”;As a youth: Secure 100 victories in “Three Kingdoms Kill” to unlock the talent “Rising to Prominence”;“Absolute Focus,” “Eat without Gaining Weight,” “Never Nearsighted,” “Five Seconds to Sleep,” “Photographic Memory”...With the continuous acquisition and accumulation of growth energy, more all-around talents gradually emerged...Starting as a well-known internet sensation baby cutie and accompanied by the neighborly companionship of a girl who was like a sister from another life, enjoy the sweet, loving daily life of winning from childhood to adulthood!

Choi Hyun-seok, a heavyweight champion of the biggest mixed martial arts league on Earth and the one who was called the strongest had died.Afterwards, he was granted new life as a hero in another world.‘Wealth! Honor! Endless beauties at your fingertips!’With thoughts of such a dazzling future, the first thing that he saw when he came to this new world was a towering ox monster.The monster, who was the commander of the demon army, asked.“Hero? You’re saying you’re the hero?”“Uh…I think…?”And so, that was the start of hell.