MTL - Rebirth In the Last Days: I Am Hoarding Tens of Billions of Supplies and Waiting For the Last Days - Chapter 321 human experiment

In the era of interstellar warfare, every melee mech will be paired with a long-range sniper mech to cover the battle.
The sniper mecha master Yan Xueshan (beta) and the melee mecha master Arthur (alpha) are just such a pair. The two have been together for six years.
The upcoming Armageddon is a near-death battle.
the day before.
Yan Xueshan: “Remember to write a suicide note in advance.”
Arthur said frustratedly: “I have only one regret. If I die this time, I will be a virgin until I die.”
Yan Xueshan snorted coldly: “…no promise.”
Arthur asked pitifully, “Master, can you fulfill my dying wish??”
Yan Xueshan: “?”
How absurd.
But Yan Xueshan thought about it, this is his comrade-in-arms, whose life and death intersect, chastity counts as a p- OK, I agreed! !
However, after the Armageddon, none of them died.
Not only did they become war heroes, Arthur also turned into a federal prince.
Arthur took out the marriage application, just one signature, and said honestly and faithfully: “Master, didn’t you say that you will go back to get married and retire after this battle? You help me fulfill my wish, and I will help you fulfill my wish too!”
Yan Xueshan: … something seems to be wrong?

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- Description from novelbuddy

A 29 year old civil employment exam student wakes up in a blank white room and meets a baby angel. This baby angel informs him that he died in his sleep due to heart disease like his father and grandfather. Remembering his mom and their last conversation he says that he will take on a series of life and death tests that the baby angel offers him. From this point on he must put his life on the line and fight in the stage called ‘Arena’. And Every time he clears a test he will gain abilities and weapons to increase his strength. All to clear the tests and get his life back. This is his story of his fights in the ‘Arena’.

Laviore Bailey—the ‘fake saintess’ who banished the innocent princess and stirred up bad blood to wage war.

She’s the villainess with a façade of a saintess.

“I love you. So just shut your mouth and die. Okay?”

But the moment her trusted lover chose her as a sacrifice to the demon, and she realized her father was behind the plan, she killed herself by swallowing poison.

It hurt. It was so painful that she could not even scream. But it was fine. Because she knew this was not the end.

“I will save you this time.”

Then, she came back for her second life. She was determined to rescue those who were unlucky because of her and restored her life back.

“You do whatever you want for the man in your dream.”

Demian said with a rough smile.

“I’ll also protect you the way I want to.”

To be exact, the female lead is an “older sister” type, amid many beauties and handsome guys, she's no white lotus.Also, it's said that the name of this book is the same as a brand of sheep's milk powder.