Strong Female Side Character Awakens - Chapter 290 - Why This Time?

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

The young lady from the Xue family was talented and beautiful, and married the dream husband at the age of 16. They had a loving and harmonious relationship and were together for 3 years when her husband attained the title of Imperial Scholar.

Now that he had attained glory and honor, he was dissatisfied with his commoner wife. He craved power and wealth; in his quest to become prince consort, he regarded her as an obstacle to marrying the princess and was willing to murder both his wife and children.

The arrogant and willful princess stood before her and ridiculed her: “So what if you are exceptionally beautiful and have unparalleled talents? After all, you are only a small official’s daughter, for this princess to crush you – is just as simple as crushing an ant to death!”

Her reputation was smeared, she committed suicide by hanging, her brother was murdered while seeking justice for her, and her old father fell ill from the chain of grievous news and passed away.

During the 42nd year of Hong Xiao’s reign, Yanjing’s no. 1 beauty, Xue Fang Fei, passed away. She reincarnated into the body of the Grand Secretariat’s daughter, Jiang Li, who drowned and was granted new life!

She got into a prominent family and engaged in dirty, underhanded dealings non-stop. She came across all sorts of bad characters, be they monsters or freaks, she dealt with them accordingly. An eye for an eye, a tooth for a tooth.

Once she was soft-hearted, but now she has become heartless! Jiang Li swore never to be an insignificant character again, and never to allow anyone to trample over herself again. This lifetime, she would seek justice by having her revenge and resolving this blood feud!

He is Northern Yan’s youngest duke, he is unrestrained and beautiful, he is capricious, and he collects the world’s strangest flowers.

Everyone said that the Grand Secretariat’s second daughter is spirited and lovely, pure and kind, and that she is likened to a white lotus.

He is clad in beautiful, red clothes, and retorted with a smile, “A white lotus? She is clearly a man-eating flower that eats people without spitting out bones!”

Jiang Li: “Duke, careful you don’t break your hand.”

Ji Heng: “Such a ferocious man-eating flower, of course I’m going to snatch it home to safeguard.”

An unrestrained hunk vs a daughter from an aristocratic family. The pair of wolves in sheep’s clothing join hands to tyrannize the world.

- Description from Novelupdates

Eight years of climbing the Tower taught Dante one thing: trust gets you killed.He learned that lesson when his best friend sold his entire party to the enemy. Now he's back at the beginning with eight years of future knowledge, a dead sister who's suddenly alive, and a front-row seat to watch his future betrayer charm everyone around him.The smart move would be to kill Adrian now, but Dante has a better idea.He's going to smile, play along, and take everything Adrian wants for himself, the power, the connections, the allies and before putting a knife through his empty heart.Revenge is a long game. Good thing Dante already knows how it ends.