MTL - Demon Slayer Starts From the Proficiency Panel - Chapter 168 [168] Heaven and earth change, catastrophe comes

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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Occupational Analysis of “Crown Princess”:

Number One: Promotion prospects are bleak, Crown Princess—Empress—Empress Dowager, the time between each is vast, and difficulty is extremely high.

Number Two: No guarantees of continuous labor, not to mention the lack of insurance, you can be dismissed at any time, furthermore you will no longer be able to start another career!

Number Three: The nature of the job is dangerous, at any time there is the danger of death, if the Crown Prince isn’t able to ascend as emperor, you will fall out of luck together with him, if the crown prince ascends as emperor, you have to be careful as to not unluckily fall alone.

Number Four: Moonlighting as a s*x worker, though the intensity of the job is unlikely to be very big, however, there is no power to select the service partner.

To summarize, the job of Crown Princess isn’t particularly a good job, no prospects, large stress, and the manual labor is intense……

Okay, in fact that was just a flood of words, a simple summary is:

This is a story about a “woman’s” struggles in the harem……

At the same time, it is also about a “man’s” sufferings in the harem……

- Description from Novelupdates

“I like you, can you be my girlfriend?”“I am sorry, but I like girls, not boys!”The words of the campus belle immediately broke our boy’s heart.In sadness, he ended up playing a recently popular online game; but even their the 3D girl he liked was in a lesbian relationship with another NPC.But who would have guessed: A little accident made him wake up as a small-time villain character in this game he used to play?Feeling frustrated, he embraces his identity to avoid his tragic death.But Amar’s greatest enemy is the female protagonist who tries to make a big yuri harem with all the heroines.As a villain, can he steal her girls instead & achieve a perfect ending and uphold the dignity of our fellow men?

When a national athlete of China laughs at being able to win a gold medal in video gaming, what a pro-gamer like yourself ought to do is take your size-42 shoe and measure it against his pretty face!