Transmigration: Flirted with My Childhood Sweetheart - Chapter 19 - 18 Whatever You Think, Comes

The story is centred around a cute android who initially had a happy life with her master who dearly loved her. But she was then struck by a series of misfortunes and ended up in a robot-equivalent of concentration camp. Through experiencing and witnessing the sufferings towards herself as well as the people/robots around her, she eventually gained a better appreciation of life.

Civilizations change and the era restarts.

The world returned to the age of steel and steam is full of chaos, madness, twist and evil.

Among them, a group of sorcerers called truth followers have done all their bad things.

They sacrificed to evil gods, besieged the Pope, assassinated the emperor, and even provoked the First World War…

All of this had nothing to do with the transmigrator Melon. When the world was in turmoil, he was the one who squatted aside and watched the show.

Until one day, this group of people came to him and insisted on recognizing him as the leader, and also said that he was the son of destiny. Everything they did before was because they followed his instructions…

- Description from novelbuddy

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.