As the Minor Gay Love Rival in Het Novels - Chapter 7.7

On an ordinary day, Lucius stumbled upon a strange, run-down shop. At first, he assumed it was abandoned—until he stepped inside.[You have entered the Universal Alchemy Store.][Congratulations! You are now the store’s owner.][Please craft your first potion.]Lucius blinked. 'What kind of joke is this?' But as if guided by an unseen force, he followed the instructions. Minutes later, his first creation was complete.[Love Potion: The drinker will fall in love with the first person they lay eyes on.]Lucius swallowed hard. 'Wait… does this actually work?'Before he could process it, the shop’s door swung open.Standing in the entrance was no ordinary customer—she was an elf. Long, pointed ears, mesmerizing green eyes, and a body sculpted by the gods. A visitor from another world.A dangerous thought crept into his mind.'Should I test it on her?'

Elijah is dying.Afflicted with terminal cancer, his days are limited. So, after deciding to spend his remaining time with family, he boards a plane and sets off for the Pacific Northwest to be with his sister. However, along the way, Earth is transformed by the touch of the World Tree, injecting it with magical Ethera and connecting it to a much larger universe via the System. More importantly for Elijah, though, it also causes his plane to crash, stranding him on a deserted island. But all is not lost, and through the System, he gains the Druid archetype that may be enough to allow him to survive a hostile environment filled with powerful monsters as well as more mundane threats like starvation and the elements. Meanwhile, his sister, Alyssa, must survive the collapse of civilization as she knows it while trying to keep her family safe. Follow them as they try to navigate an apocalyptic world full of game-like stats, classes, and threats aplenty. Current Release Schedule is one chapter a day (7 days a week) at 11AM CST. Patreon is currently 70 chapters ahead, with an extra chapter (for 8) each week.

At 3 years of age, her father went missing. At 15, the muscle in her hand snapped. At 16, her mother passed away in a car accident. At 19, she was framed by her uncle. At 22, she was burned alive by her newly- wedded husband and her best friend. Perhaps it was God’s sympathy that allowed her to return to the time when she was 15 years old to re-live once more. The previous lifetime of being low- key and having forbearance resulted in betrayal and misery. In this lifetime, she must be lofty and domineering to let those who have bullied her suffer a terrible end!

- Description from Novelupdates

5 years after the world changed, the final boss appeared.