Guild Mage: Apprentice - Chapter 111. Letters

Aaron, a wildlife biologist, became a military strategist right after a global war between nations began.He never wanted to participate in the war but he had to, because he wanted to continue his studies on endangered species the moment the war was over, but to his surprise, everyone in his unit were killed, including him, and the next thing he knew, Aaron woke up in the body of a young noble having a similar name to his.However, he also noticed he had awoken in a world different from Earth.In this world, demonic beasts ran rampart with only one thought in mind, causing them to feed on anyone they see, be it humans, elves or even magical beasts as well.During his first encounter with a magical beast, Aaron awakened a system which allowed him to bond with magical beasts and to obtain terrifying abilities from these bloodcurdling magical beasts, so he used his experience as a wildlife biologist to help make it easier for him to bond with these beasts.However, Aaron also noticed he could evolve these beasts if their loyalty towards him had reached a certain level, so he vowed in his heart to grow strong enough to protect those he cared about in this world with the hope of living a happy, peaceful life where he'll be able to focus fully on his passion as a wildlife biologist.

It took Gu Yu twenty years to realize that he turned out to be the vicious cannon fodder male supporting role in a novel.
Forcing the protagonist to sign a contract, and being playful and affectionate, he ended up with his family ruined and his family destroyed.
Just as he was about to establish a good relationship with the protagonist Gong and take advantage of the loopholes in the plot,
Who would have thought that the protagonist Gong in the book, and the ruthless boss who did not get along with the protagonist in the end, was actually his ex-boyfriend who was abandoned by him in high school? !
Oh ho!
Gu Yu: Thank you for the invitation, please don’t bother me.

Gu Yu, who was forced to follow the plot, faced the furious protagonist Gong who seemed to be about to commit murder in the next second. His ex-boyfriend,
With the wife of the future protagonist Gong in his arms, his current gossip partner, he numbly recited the lines: “I warn you, this is my man.”
Seeing Fu Yeyu, who was blazing in the eyes of the opposite party, who could pounce on him and tear him apart in the next second, he couldn’t help but reflect on himself: Why can’t I think about the protagonist’s attack? !

The main attack, the idler should be the heartless attack × the irritable boss suffers
Gu Yu×Fu Huayu

Content tags: strong, broken mirror, reunion, entertainment circle, wearing books
Search keywords: Protagonist: Gu Yu, Fu Huayu ┃ Supporting role: ┃ Others:
One-sentence introduction: Destroy, I’m tired
Conception: go round and round, or return to the original origin

- Description from novelbuddy

After a catastrophe swept across the world that destroyed half of the population and countries, a mysterious force passed through the earth that affected all residents, plunging them into unconsciousness for several hours. No one knew what it was.A few lucky people have received the revelation that the world will be destroyed in ten years. During these ten years, the world is waiting for ten disasters, and the last of them will be the end of the world.Another group of people also received a revelation that salvation is in another world. This revelation opened the way for them to another world where they could find solutions to save their home world.The rescuers were young people who were not yet twenty years old. They became awakened, able to transcend the boundaries of worlds.Idan was not among the chosen ones who became awakened. However, luck smiled on his older sister.A year after the world experienced its first disaster, Idan accepted an invitation to attend a grand ball dedicated to overcoming the first of the ten disasters.That day, during the ball, he met a young girl, and some mysterious force chose him. He awakening a mysterious system—the Supreme Husband System. In turn, the girl also received her own system — the Supreme Wife System.And so, the first task he received from his system was to propose marriage to his future wife within one day!English isn't my main language, so please bear with it if you found some mistakes.

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.