My Whole Clan Was Exiled, and the Widow Squad Made Me Emperor

[Alternate History + Exile and Famine + Decisive and Ruthless + Protective of His Own + Invincible Protagonist + System + Sign-In]

In the tenth year of the Yuanwu era under the Great Zhou, every man of the Chu family, the greatest military clan in the land, is killed in battle!

Jealous of the Chu family's achievements, the emperor orders their estate seized! His aloof wife and seven peerlessly beautiful sisters, each a supreme female general, have their cultivation crippled and are exiled to the most perilous place in the land: the Northern Wasteland's City of Sin.

I, Su Chen, the Chu family's most despised good-for-nothing son-in-law, am exiled with them. Everyone is certain that a household of frail women and one good-for-nothing won't survive three days in the Northern Wasteland.

At the brink of despair, I awaken the [Polar Sign-In and Construction System]!

By day, I'm the good-for-nothing son-in-law who serves tea and cooks, while the female generals risk their lives to shield me.

By night, I don a mask and become the tyrannical, invincible “Lord of the City of Sin”! I sign in to claim the Great Luo Heavenly Demon Physique, Gatling blueprints, and special-effect antibiotics! I slay bullies and slaughter demons, secretly tempering their bodies and purging their impurities!

The female generals revere the “Lord of the City of Sin” as a god and secretly fall for him, never realizing that the invincible overlord is the very son-in-law who brings them water to wash their feet every day!

Three years later, demons invade from the south, and the Great Zhou emperor flees in panic to the Northern Wasteland to beg for help.

But in the swirling snow, a mechanical city of gods rises from the earth, its walls forged of steel. I sit high upon my throne, with the Vulcan cannons roaring behind me. “Anyone who lays a hand on my family dies! If you can't rule the Great Zhou, then I'll take your place!”