MTL - Godslayer In the Comic World - Chapter 2 picked up a heroine

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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A lonely soul, which was placed under the care of the Lord Protector’s Manor, ended up having her lover stolen by the family’s eldest daughter and dying tragically the day before her wedding.

Somehow, she was reborn in the family as their 14-year-old first wife’s daughter, Ning Xueyan, with a startlingly familiar face.

Step by step, she will ruthlessly scheme to seek revenge as well as uncover the mystery of her tragic death.

Her former fiancee, the flirty crown prince and the bloodthirsty prince, will now bear witness to a vengeful Ning Xueyan becoming the peerless lady of her generation…

- Description from Novelupdates

The romantic comedy light novel series centers on the gaming lives of various high school students who play video games, including: Keita Amano, a lonely young man who loves video games; Karen Tendō, the beautiful president of the video game club; Chiaki Hoshinomori, who constantly fights with Keita; and Tasuku Uehara, who puts on a facade of being satisfied with his life in the real world, but he in truth loves video games.

Xie Yang has spent many years in the apocalypse and is tired and worn out. Then he transmigrated into a simple and superficial novel about the entertainment circle.

The protagonist of the novel was handsome, smart and reborn. The female protagonist of the novel was beautiful, inspirational and had a golden finger. Some male and female roles were also beautiful and had a deep background. If he casually transmigrated into one of them then he could close his eyes and enjoy himself. However, he didn’t transmigrate into any of them and instead became the hidden husband of the biggest villain in the novel, the male protagonist’s uncle.

He was called a husband but it was more similar to a babysitter. This was because the biggest villain in the novel was a terminally ill patient with a terrible personality and a sick brain (really sick). They got married for the sake of happiness.

Xie Yang: It doesn’t matter if you are the male lead, the female lead or the villain, whoever dares to stop me from living a comfortable life will die.