Power of Runes - Chapter 44: Betrayal

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

Set on a giant, almost finished bridge between Sadogashima and Niigata. Abandoned by the government, the bridge, and the giant man-made floating island at the center, has become a city of criminals and societal drop-outs.

Set in the same world as Durarara, but 15-20 years later. There is almost no overlap between Etsusa Bridge and the other novels.

In the late years of the Daqian era, tyrants roamed freely, war erupted endlessly, and the people could not sustain their lives.After transmigration, Chen Jie finds himself as a drunken gambler with a pair of unfortunate sisters at home.The elder one, Su Yunjin, is his wife, and he also has a five-year-old sister-in-law, Su Yunrui.Their family is so poor they can barely make ends meet.Then suddenly, his beautiful wife comes smiling, bringing him a bowl of hot porridge.“Husband, I was wrong yesterday. Please have some porridge while it's hot.”Seeing the bruises on his wife's face, Chen Jie feels something is amiss.Ding~[Daily Information has been updated][1. Yesterday, you gambled away the last three acres of good land, beat Su Yunjin while drunk, and planned to sell the five-year-old Su Yunrui, to recover your losses.][2. The Su sisters rely on each other. Su Yunrui is Su Yunjin's only hope.][3. Su Yunjin, having lost hope, traded her mother's hairpin three days ago for a pack of arsenic.]...Arsenic!Staring at the hot porridge brought to his lips, Chen Jie looks up at his wife, seeing the faint bruise on her face and her eyes shifting away, avoiding his gaze.“Honey!”“Yes?”“You're not going to kill me, are you?!”

Zhou Wenwen, who had traveled to a parallel world because of sudden death, thought that he could only live in such an ordinary life in this life, but the golden finger finally opened. He has a store where he can buy technological items and magic equipment to ensure his survival.

But the threat that followed made him realize that this place is not ordinary, because there are Transformers, Marvel, the Dark Portal from World of Warcraft, etc.

- Description from novelbuddy