It Seems That I've Slipped Into a Different World. Also, My Gender Has Changed. - Chapter 45: It Arrived, the Wax-Sealed Letter

As the youngest son of a top chaebol in the Blue Star entertainment circle, Lin Zhibai thought that his life was just to eat and wait to die.

Until that summer.

The system fell from the sky, and he awakened the memory of his previous life.

“So I’m from Earth?”

- Description from novelbuddy

In a not-so-distant future, Earth is thrown into chaos by a weird alien ship that crashes and starts leaking spiritual energy all over the place. This energy messes with the planet’s ecosystem, making everything mutate—animals, plants, even people. It’s like nature’s gone wild, with some folks getting crazy supernatural powers while others struggle to survive against mutated creatures and power-hungry groups trying to take control.In the middle of all this craziness, Amira Hailen—a tough-as-nails ex-special forces assassin with a complicated past—gets a second shot at life. Thanks to a mysterious ally’s Mental Transference powers, she’s sent back in time, waking up with the ability to control ice. Determined to keep humanity afloat, she gathers her old crew and turns them into a reliable team amid all the chaos.Meanwhile, Aiden Emberstorm—a fiery elite operative—gets fed up with the government’s weak response to the crisis. With his own fire powers blazing, he ditches the bureaucracy and teams up with his battalion to protect innocent lives. He becomes a symbol of resistance, taking on mutated beasts and rogue factions while trying to restore some order.When Amira and Aiden cross paths, it’s not exactly love at first sight. Their icy and fiery personalities clash, but they can’t deny the need to join forces. They both want the same thing: a sanctuary where survivors can be safe. So, they decide to work together, hatching a plan to take down the alien ship before it can call in reinforcements for a full-scale invasion.Amid epic battles, unexpected alliances, and a budding romance, Amira and Aiden must face both their inner demons and the alien threat. It’s a fight for survival in a world that’s gone wild, with everything at stake—including their own hearts.

When she woke up, Lake returned to the classroom of the third year. The classmates were in class with swords and sticks, and the teacher became a female Taoist.
The little fat man in the back seat, how to put two big hammers under his chair.
Rick found this to be a global era!

- Description from Uukanshu (translated)

“I'll do it. I'll do anything you want”Raiden clicked his tongue in a disapproving tone then raised Hiro's head once more.“That's not what I want to hear, Hiro” He said. “I want to hear you say it with your lips. I want to hear you acknowledge what you will be to me and your status from this day henceforth.”He stared deep into Hiro's beautiful brown eyes as he spoke; “Say that from this very second, you belong to me. Your body, your soul, your mind, every part of you belongs to me. You will be my pet and remain by my side. You will do whatever I ask you to do. Tell me that I own you, Hiro.”Raiden's voice was frighteningly deep and Hiro felt shivers run down his spine. There was nothing he could see but Raiden's smokey grey eyes, his handsome face and that devilish smile that gave him goosebumps and made his heart tremble with fear.With tears running down his cheeks, he balled his fists and spoke softly; “I promise, Raiden, from this very second, I belong to you. Every part of me is yours. My body, my mind, my soul, everything is yours. I will be your pet. I will do anything you ask of me. I will give you everything that I am. You own me, Raiden.”Watanabe Hiro used to be very rich. As the last child of the Watanabe family, he was pampered and spoilt by everyone but he was a good kid. He was obedient and friendly. Nice and very caring. He never did anything to worry others. He also had a lot of friends. Some were with him because they genuinely liked him while others were with him because of his wealth. That is, until a calamity befell his family and everyone he considered a friend abandoned him.Hiro was forced to live a wretched life for 4 years until he met a former senior who was ready to save him but under one condition.Hiro had to become his for a year.