MTL - Top of Qinglian - Chapter 40 Liu Huairen

Liola—the best assassin in his world—has vowed to kill no more. He was being chased by an assassination organization when he accidentally dropped into a parallel universe: through a dimensional gate and into poor teenager Kaiser’s apartment. Instead of going to the government shelter for lost dimensional travelers, Liola and Kaiser wind up going to school together.

Liola has been trying his best to live the life of an ordinary person, but after certain things happen one after the other, he begins to realize that being an ordinary person could be harder than being an assassin.

Time flew by. Even though their graduation was a long time ago, after countless nights and passing through fleeting time, their story is still circulated around the quiet campus of University G. This story has many different versions, but there is one thing that everyone knows to be true. Back then, that ordinary girl betrayed the genius of the fine arts faculty and yet, his love for her still remained. For her, he nearly died in a fire. For her, he gave up his chance to study abroad. Years later when they meet again, he is successful with a new girlfriend in his arms and she is indifferent with a light and clear smile. However, unknown to anyone, her longing had begun long ago and even now flooded her thoughts…

- Description from Novelupdates

After traveling to the Tivat continent, Lin Mo became a jar merchant, and since then he has embarked on a journey of selling jars.

Lin Mo: “Let’s open a jar. Whether it’s the Eye of God or the magic weapon, you can buy everything you need. You may earn blood, but I will never lose!”

Ningguang: “As long as you sell unlimited quantities, I am willing to give you all the money, and people can also give it to you!”

Hu Tao: “Golden Emperor Fen Tianyan? Or only ranked fourth on the Yihuo list? I can’t imagine the Yihuo in front of me.”

Ke Qing: “Sword Twenty-Three? Hey, what kind of terrifying swordsmanship is this!”

Yae Godko: “Touch your tail more, can you sell me an extra jar?”

Ayaka Kamari: “How can this Zanpakutō, Xiu Baixue, be so strong!”

…..

A few years later, everyone in the entire Tivat continent was looking for the jar left by Lin Mo.

- Description from novelbuddy

Yang Feng somehow transmigrated into a different world and received a legacy of an ‘ancient high tech’ family, which does not directly raise his power, but gives him the technology to build things which are way more advanced than the seemingly medieval world.