The Dungeon Conquerors: Journey to the Peak - Chapter 23: Ch : Seventh Floor

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.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

After accidentally falling, she actually finds herself bound to a Second Female Lead Counter Attacking System!

There was a mysterious old man who approached the failed swordsman with the “100 million years button”. A magic button which can achieve the same effect as training for 100 million years if you push it.

The failed swordsman who pushed the button had his doubts, but immediately felt tremendous power rising in his body. So he pushed the button many times.

However it was a cursed button. The moment it was pushed, he was confined to the 100 million years prison of time. The first 100 years were devoted solely to training. After 1000 years he had forgotten why he swung his sword. He stopped thinking completely after 10,000 years had passed. After 100 million years he became crippled and finally managed to return to the real world. At the same time losing all his memories from the past 100 million years, the only thing that remained were his sword techniques. “I can become stronger just by pressing the button!” or so he thought and pushed the button many times after that. Foolishly trapping himself in that 100 million years of hell each time.

As he continued this loop, he began to think “If I destroy this world, will I get out of here?” A few billion years later, he finally escaped from the loop.

This is the story of a failed swordsman trying to make a name for himself in the world.

Just when I got to know her, the hairy girl only wants to beat me up!Prim childhood sweetheart treads on me underfoot!Childhood friend turned sister suddenly demands I repay the kindness of upbringing?...Are all these twists of human nature, or the moral decay?Surrounded by young girls wielding knives, Shen Mo Dust trembles: 'Author, why do I only meet bad women?''What exactly are you not satisfied with, let's switch roles!'Jealous at having crafted the protagonist's peak of life with his own hands but without a single girl by his side, the author furiously slams the keyboard!(Spotting the little whips raised by the venerable readers, he picks up the keyboard again)The alternate titles of this book are 'They Shine Like Stars' and 'They Are Lonely Like Stars'.