The Loner Who Conquers the Other World - Chapter 11.5: Part 5

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

“I can clear all your debts, but you have to substitute me in my marriage…”

When Liang Dou Kou was diagnosed with cancer, she formed a contract with Qin Zhi Ai to substitute her in the time she would be absent, including her marriage with Gu Yu Sheng.

Initially, Qin Zhi Ai suffered under the cold and harsh attitude of Gu Yu Sheng, who mistook her for Liang Dou Kou. But his heart gradually softened and he fell in love with her.

Just when he thought that he could live happily ever after with her, it is time for Qin Zhi Ai and Liang Dou Kou to revert their identities, and Qin Zhi Ai evaporated from Gu Yu Sheng’s life.

Months later, Gu Yu Sheng meets someone who possesses the gaze of Qin Zhi Ai who captured his heart…

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

Four rich and handsome brothers up against one girl!Asher, Ashton, Ashley and Ashal are the four quadruplet sons of the Rollins family, the wealthiest family in the country of Danvarr. They’re notorious for being sexy, smart businessmen like their father. The brothers never use their real names in public spaces and all go by ‘Ash Rollins’. They all wear the same hairstyle and swap identities almost all the time. Even their parents can’t always tell them apart. Only the brothers can.Demi is a sweet, hardworking twenty years old girl who works at a book store. When her boyfriend cheats on her because she wanted to wait till marriage, she makes a poor decision to drink for the first time. Her night is so crazy she wakes up at home with a marriage certificate in her hand signed by one Ash Rollins. The problem is she can’t recall much and doesn’t know which of the brothers she married. Typically, all the quads deny her claim and the billionaire family kicks her out of their mansion.Demi’s fate changes when the annulment of the marriage threatens the social image of the Rollins Empire. The family proposes Demi plays their daughter-in-law for a year till the tension blows over. Demi accepts only to teach the quads a lesson. Since her true husband won’t step up, Demi is allowed to choose any of the quads to be her husband.Her ‘real husband silently grows restless seeing her with his brother, but he isn’t the only one falling head over heels for the first daughter-in-law of the Rollins empire. All the brothers compete for Demi’s heart because she’s nothing like the women they’re used to. Will their obsession to win her heart finally tear the brothers apart or will Demi’s big secret do the trick? Which ‘Ash Rollins’ will win the girl in the end?