Kyoukai Senjou no Horizon - Volume 1, Chapter 15: Gathered Friends in the Confined Room

When Li Xianyu was 20 years old, he received his father’s inheritance, an 18-year-old great-grandmother who was incredibly beautiful.

Li Xianyu: “Great-Grandma, why are you so young?”

Great-Grandma: “That’s because I died when I was 18 years old.”

- Description from Novelupdates

“My unrequited love is over.” Compared to my perfect older brother, I, Ha Giyeon, was endlessly lacking. My first love and my last love—every single one of them were my brother’s friends. What I got in return for pouring all my affection into them were cold, violent words of rejection. Then came the thunderbolt: I wasn’t even their real son. My family, whose love I desperately sought, kicked me out of the house. Even though I scraped by doing hard labor, it didn’t feel like living. Then came the sudden car accident. Right before dying, I regretted everything and begged— That if I ever got to live again, I would never give my love to the family who scorned and discriminated against me, nor to the brothers who tormented me under the pretense of affection. I would live a life that was truly my own. And as if it were a lie, in the winter of my 17th year, Ha Giyeon returned. As Ha Giyeon began to change, so too did the family and the brothers who had once trampled him…

[Apocalypse] + [Rebirth] + [Hoarding Supplies] + [Surviving] + [Infinite Space] + [Dark Revenge & Non-Saintly]The world enters an Ice Age, ushering in an icy apocalypse where 95% of humanity perishes! In his past life, Zhang Yi was killed by those he had kindly helped, due to his benevolent nature. Reborn a month before the ice apocalypse, Zhang Yi awakens a spatial ability and begins to hoard supplies frenetically! Running out of supplies? He empties the warehouse of a super-mall worth billions! Uncomfortable living conditions? He constructs a super-secure dwelling comparable to a post-apocalyptic fortress! As the apocalypse arrives, while others freeze like dogs and would abandon anything for a bite to eat, Zhang Yi lives even more comfortably than before the apocalypse.Green Tea b**ch: “Zhang Yi, let me into your house, and I promise to be your girlfriend.”Rich Second Generation: “Zhang Yi, I’m willing to trade all my wealth for a meal at your place!”Beastly Neighbors: “Zhang Yi, you should share your supplies with us, don’t be so selfish!”……Watching these people who betrayed him in his past life, Zhang Yi lies comfortably in his safe house, living a carefree life as if in a paradise.Zhang Yi: “Why should I care whether you live or die? I would rather feed my things to the dogs than give them to you!”

Every human has their Personal Jewel of power, when awakened it can either be an Elemental Jewel or Physical Jewel. They circle the right and left wrists like bracelets of power.