I Shaved. Then I Brought a High School Girl Home. - Volume 1, Chapter 11: Smile

On the will left behind by the 14 year old suicide victim K:

“Taku Sugawara is the devil. Nobody should believe his words.”

The number one socialite, Song Ci, marries the most handicapped man, Han Zhan!

In her previous lifetime, they had married for five years. He meant everything to her, but she was thrown away like an old shoe.

He crossed over to a new world where humans have magical power. They are called warriors. They use their power to kill the monsters that appear out of nowhere. Dragons, Dungeons, and Magic users are pretty common in this world. If you want to live in peace, you need to have that power. You can also become a powerful clearing dungeon.

In this dangerous world, he has a system that can help him grow stronger. But he didn't want to be a high-profile warrior who attracts much powerhouse attention or become a lab rat. He wants to be Low-profile and grow strong using his system.