Chrome Shelled Regios - Volume 16, Chapter 2 — Truth and Reality

After the Catastrophe, every rule in the world was rewritten.

Good and bad luck has followed Zach ever since he was five. Poor guy. His life has been far from the sweet and peaceful paradise one might expect of the youngest son of one of only four dukes in a great Empire.But a little more excitement than expected doesn't stop him from pursuing his dreams of summoning, and perhaps his luck is finally turning once he manages to summon something great.Armed with maids, a scummy gift of luck, and a strong will, Zach sets out to live life as he pleases, even to the annoyance of those around him. First stop: The Academy.

The celestial celestial beings who lived for more than 100,000 years were born and reborn in a small monk in a human world.
His motto: “It’s not as good as a medicinal medicine for ten years of hard work.” “Even if you practice a copper-iron bone, it’s not enough for my soldier’s attack.”

- Description from Novelupdates

Wang Yi had just transmigrated when he experienced being cheated on, going through a divorce, and being kicked out of his home. These were events faced by a useless male character.

However, he soon discovered that this world seemed out of sorts. There were martial arts grandmasters and martial arts clans?

Fortunately, he activated the Martial Arts Sign In System.

[You have successfully signed in and obtained the Dragon Elephant Wisdom Technique. Please cultivate according to the instructions.]

Thus, Wang Yi kept signing in until he leveled up and became a martial arts grandmaster. After that, he discovered the truth behind his wife’s affair.