From Abyssal Invasion to Bursting Stars with a Single Sword - Chapter 995 - 576: Doomsday of the Divine

Seo-jun was your average college student until a fatal vehicle accident took away his life. He found himself waking up in the body of Adrien Mallorne, the youngest son of a Count. Armed with his modern-day knowledge, he navigates through the new world he finds himself in. But why is the second prince following him around and blatantly flirting with him?_______A long arm that looked muscular, even with it being fully clothed, reached out above him. “Is this the one you want?” A familiar voice asked, sending shivers down Adrien's spine.It's the guy from the bookstore!Adrien nodded his head to answer the guy's question, forgetting that he probably wasn't in the best of position to be seen. “Ye-yeah.”Long, thick fingers wrapped around the spine of the book, swiftly pulling it down from the top shelf. “Understanding Economics?” The guy read the title out loud. “Mr. James' class?”“Yes.”The guy, who was standing close to Adrien, basically caging him in between his chest and the bookcase, handed him the book. The guy then reached up one more time and grabbed a green-colored book. “I suggest reading this one if you haven't taken the assessment yet.”Adrien took the book from him. “Thank you.”A deep voice rumbled from behind him as the guy laughed. He then took a step back, releasing Adrien from his confinement. “Try that again, but to my face this time.”

[You have entered the dungeon at Gwachun Station’s 1st Exit.] When former high school student Kang Woojin finds himself returned back to Earth after being forcibly summoned to a foreign planet for 20 years, he soon finds that Earth is not the same, normal place as he once remembered it to be.

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

Mason was a mercenary, until the day he died on a mission after being betrayed by his unit.