It's Actually Not Easy Wanting to be a Supporting Male Lead - Chapter 6.5-6.6

Born and raised in a lab Tristan must figure out how to live and survive in the outside world. To make matters worse he has 4 others to look after. He's the oldest but is always being taken care of, to make sure his lab siblings want for nothing, Tristan will need to make a difficult decision. The goal is to provide for his siblings but he ends up living just like he was groomed to live. On top of everything else, there are four alphas who want to mate with him, and they don't mind sharing. Will Tristan accept his fate? Or will he runaway?

In the twenty-ninth year of the First Emperor, Bo Langsha was attacked.

When Ying Zheng merged the memories of the 21st century history doctor, looked at the mighty mountains and rivers in front of him, and said to himself, “In this life, my Daqin can’t die!”

- Description from novelbuddy

In a world where money and power trumps all, Ahn Soo Ho, A.K.A. Magician, uses his superhuman abilities and his knowledge of the intelligence world to climb to the very top of the totem pole.

Quinn Winter is a young man from another world. One day, he is suddenly chosen to become the new Demon King. But the Demon Kingdom is in big trouble – it's losing a terrible war against the human kingdom called Gran'le.To help his people, Quinn comes up with a risky plan. He will sneak into Gran'le and learn their secrets. But things don’t go as planned. A powerful noble sponsors him, and he ends up joining Heavenward Academy, the top school for training future heroes.At the Academy, there's a big challenge called the Selection. The best students become Paladins – magic knights who fight demons. Quinn doesn’t want to become a Paladin. He is a demon king! But now, he’s stuck in the Selection… and if he wins, he’ll become the very thing he’s supposed to destroy.He started the day badly. Now, things are getting even worse.