Apocalypse Days: I Rule with Foresight and a Powerful Son - Chapter 108:

“Legend had it that in the deepest part of the oldest galaxy, there was a door as red as blood and fire.

Legends and myths, darkness and light, countless stories passed through this old door.

The Door of Constellation that overlooked everything would warn the sky and earth, sending darkness back to where it belonged.”

The Empress who dies in torture, An Rushuang is her name. After she wakes up, she finds herself has time-travelled to when she was twelve years old, but she would turn into Major General’s white horse at night. He is a general who orders about the winds and clouds on the battlefield, and she is a little girl lives in her boudoir seclusively.
She endeavors to change her fate, and he spared no effort to win every battle. They meet each other every day, well, it’s night to be accurate. Is that a dream or not? She pleads to marry the seignior to win peace for her family, only to find he is the one she is going to marry.
“Growing old with you under the same roof is my long-cherished wish”, thought them both.

- Description from Novelupdates

[Attention, humans][Welcome to Midgard, a realm between life and death.][All 300 players accounted for!][Evaluation successful!]Jamie never expected his life to end while saving a stranger. One moment he was pushing a pregnant woman out of the path of a roaring truck—the next, he awakens in Midgard: a realm where death is just the beginning.He isn’t alone. Two hundred ninety-nine others, torn from their final moments, stand beside him. Their fate? To endure ten brutal trials that test body, mind, and spirit.Each challenge grants skills—swordsmanship, magic, strategy—that could mean the difference between survival and annihilation.And at the end awaits a choice:Reincarnate into a fantastical new world, carrying every skill earned.Return to Earth … alive, but powerless.But in a world where trust is fragile and every alliance can shatter in an instant, Jamie must decide—Is mere survival enough?Or will he fight for something greater?

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.