MTL - Good Morning, Miss Ghost - Chapter 18 Buffy

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

While returning home from a boring day of work, a black hole opened up in front of John and sucked him in. Before he was floating in the blackhole, a helmet latched on to him. "Uploading A.I under progress...Activating Survival Kit" A weird robotic sound appeared within the conscious of John and suddenly a white energy enveloped him... After opening his eyes, John noticed he was teleported to a whole new world. A world of magic and he was a user of a system. Arkon, the world John was brought too, was a medieval world which is 10 times bigger than earth. This new world held many new mysteries and this was the beginning of John's adventure. John will dominate and stir the world with his new system. Old technologies begone and use my advanced techys instead! Ha! you want to hold a politic, economical and military war with me? Sorry but my system is too broken for you all to counter.

Renji had many exes.

However, these exes were all fictional characters in a post-apocalyptic game.

As an absolute devotee of strength, whenever a character became useless in the game, Renji would strip them of their equipment, claim their resources, and relegate them to the background as caretakers, giving the best to new powerful characters.

Of course, Renji always insisted that this was temporary, all in the name of advancing in the game and saving this precarious post-apocalyptic world!

But...

These “Fictional Characters” didn't seem to see it that way.

When Renji, with his emphasis on strength and meticulous planning, fulfilled his mission as the “savior,” putting an end to the source of Tainted Miasma in the wasteland and becoming the first to achieve a “perfect clearance.”

He unexpectedly found himself transported to the game's second stage.

He had thought he would soar directly, living a carefree life, but Renji realized that things were not quite as he had imagined.

……………………………………………………………

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Wonder Woman: Why are you Superman’s younger brother? Eric replied: On the first day of travel, I, who was also a baby, climbed into Superman’s baby capsule, pushed him out, occupied the nest by myself, and became a “son of Krypton”.

Superman: Why don’t you save the plane? Eric replied: I will not lift things by stepping on the air.

Batman: Why didn’t kryptonite work for you this time? Eric replied: I originally wanted to get along with you as a Kryptonian, but in exchange it was alienation.

Okay, I’m not pretending anymore, I’ll showdown, I’m a native of the motherland. …… This is a story about a man who was mistaken for a Kryptonian with a template of the motherland, but is actually a sinister and black guy who is doing things in the world of superheroes.

- Description from novelbuddy