Toaru Majutsu no Index - Volume 22, Proclamation of Armistice.

Journey through the combined world of the Special Forces series and become the acknowledged bad soldier of the Iron Fist?

Don’t panic! The “Strongest Individual Soldier System” is here to help. Every time you upgrade a level, not only will your body be strengthened, but you can also acquire super skills. At the beginning, you will activate the S-level shooting skills, which will amaze the audience and overwhelm everyone! Thus, a vanguard that made the heads of state tremble was born…

He Chenguang: “Did you practice martial arts from the womb?”

High school team: “He is the scariest individual soldier I have ever seen, bar none!”

Lei Zhan: “It’s unlucky. In his hands, I’m like a three-year-old child. I can’t beat it! I can’t beat it!”

He Zhijun: “Xiao Lin, the future of Langya is in your hands, I will retire early!”

- Description from novelbuddy

Noel Cross. A model student. A kind brother. The man every girl once dreamed of.With his handsome looks and flawless manners, he seemed perfect—at least to most.But beneath the smile… beneath the pristine facade… lies a bottomless void.And one fine day, when his smile could’ve finally turned genuine, a message appears—one only he can see.[Binding with Codex Null: Complete.][You have one free simulation available.]Now, an impossible system lies within his grasp—one that simulates his life, reveals hidden truths, and grants power unimaginable to the former him.With it, his fragile sense of control finally slips away.Love that was, in truth, obsession. Possession, teetering on madness.And a world that feels even more fragile than these women’s insecurities.Faced with it all, Noel must make a choice:Keep pretending.Or embrace the chaos…And become something far worse than anyone ever imagined.

Xiao Ze, who was dedicated to the people and vowed to become a generation of Ming Jun, accidentally fell on a little lady.
The little lady was born beautiful and lovable.
So Xiao Ze accepted his life and got the name of fear.

ps:
①The male protagonist has no concubine, and he is dedicated to serving the country.

- Description from novelbuddy

Yeho is a distant relative to a king in a small kingdom. Even though he is a distant relative, his house was very poor, and his mother was addicted to gambling. One day North Empire asked for Princess Sooyoung to be a concubine of an old Emperor because she was known for her beauty. But the king really loved his daughter so instead he ordered Yeho’s older sister to disguise as Princess Sooyoung and marry the old Emperor.

Yeho told his sister to run away with her lover, and his sister had to leave her younger brother alone with his mother. After she ran away, Yeho asked his mother to give the things back to the king that she got for trying to sell her daughter, but his mother already used the gifts to pay off her gambling debt. He was trying to give the gifts back to the king to take away his order, but now he can’t do that anymore. He tells his mother to run away, and he disguises as his sister to go to North Empire.

After he got there, he was trying to tell the Emperor the truth and take away his life, but the Emperor went out for few days to look around his empire. When the emperor came back, he wasn’t as old as he thought.