I Am Carrying Gold From the Post-Apocalyptic World - Chapter 98 – Roof Chase

William Scott, a soldier, returned to the city with the goal to live the rest of his life peacefully. He would practice the lifestyle of a retired person.

However, his mother set him up on blind dates time and again. Unwilling to keep up with her arrangements, he was left with no choice but to pretend to be in a relationship with Yvette Quinn, a female CEO who was also forced by her parents to go on blind dates.

To his surprise, this was only the beginning of many troubles to come. Before he could get to settling those troubles, he first needed to sort out an even more pressing problem.

The girl looked at him and asked, “Take a guess. Am I the elder cousin or the younger cousin? As my boyfriend, you should be able to differentiate between the two of us, right?”

His contract girlfriend was so unprofessional. Although they had an agreement, she was always asking her younger cousin to take her place and pretend to be her around him.

What should he do about that?

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- Description from novelbuddy

“From death to becoming the master of death, that's my story”[... ]Jake never got a break. Born unlucky, lived cursed, and died alone—struck by lightning on a rainy night. That should’ve been the end.But fate had other plans.In the space between life and death, he meets the goddess of Karma and Fate, who admits his entire life was a mistake—her mistake. To make amends, she offers him a second chance in a brutal new world ruled by magic, martial arts, and monsters.Before he's sent off, Jake draws from five Legendary Cards—and chooses the most powerful of them all: The Legendary Necromancer.Now, Jake awakens in a world where strength decides everything. With his unique talent, he can summon undead endlessly—and harvest power from the souls of his enemies.[You have enough Soul Shards.][Undead Dragon summoned.]But Jake is suddenly thrust into the Hundred Trials that comes once every hundred years in this new world, a deadly proving ground for the elite.To the others, he’s an outsider—unregistered, unknown, and unwelcomed. A threat to be erased.But Jake didn’t crawl out of death to get killed againLet them come.He has death on his side.

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.