10 nen goshi no HikiNiito o Yamete Gaishutsushitara Jitaku goto Isekai ni Ten'ishiteta - Chapter 8, Part 4: Bulletin board Chapter Yuuji, having a discussion concerning underwear situation and attire

Bai Muchen had it all — not only was he the most renowned martial artist of the Nine Heaven continent, he even had the Five Meridians of Tianling and was engaged to Xuan Qingzhu, the beautiful daughter of his mentor. But everything falls apart when he’s set up by his fiancé and mentor during a cultivation session, and he is killed.

Reborn as a young man named Xiang Nan, the heir of a declining family, can Bai Muchen get his revenge?

Shao Xuan joins a friend in his expedition to a recently discovered archaeological cave. After he picks up an ordinary looking stone he is teleported to a different world and wakes up in the body of a small orphan child. The world he is in now is still in its stone age with primitive tools made of stone and the ways of the people are savage. Savage isn’t the only thing special about the people though, because they have superhuman strength, jump higher than trees and punch stones. In short, they are able to cultivate their bodies. Despite all this, it is a real struggle to survive because of the scarcity of food. Together with Caesar, his pet wolf, he tries to survive in this cruel world.

[Ding! Your son has offended a Pure Yang Plane cultivator. A loving father should also be a protective father. You have to be stronger than your opponent. Therefore, your cultivation will now be improved to the Pure Yang Plane.]…Qin Chuan realized he could become stronger every time his son got into trouble.As such, he got addicted to tricking and pampering his son into becoming a troublemaker.…Qin Chuan said, “Son, I am invincible. So, do whatever you want and get yourself in trouble!”

I met the male lead in prison.