The supporting character's harem is very normal - Chapter 359 I want it…

Payload specialist, Tang Yue, who is a mechanical and electrical engineer by training, is left stranded on Mars when he receives news from his AI robot assistant, Old Cat, that Earth has exploded. He believes himself to be the last human in the Universe.

“If there existed a horrendous ghost among the hwarangs, who would it be? Of course, it’d be Seol Yeong-rang who uses necromancy to call upon ghosts!”

Hwarang Seol Yeong, who was named as the horrendous ghost who’d bring forth a great disaster one day.

There was only one way to get rid of the false accusations and return to his original position.

It was to prove he wasn’t a horrendous ghost by solving abnormal incidents.

Then, Ja Ha, the head of the previous generation’s hwarang, the man who killed a great evil spirit eight years prior and disappeared without a trace, appeared in front of Seol Yeong…

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“With my knowledge, give me a fulcrum on which to place it and I shall move the world!”

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Sorcerer Continent—a world where sorcerers exist. Wielders of arcane knowledge. Masters of all elements. Sovereigns of space and time. These sorcerers governed the world with their unrivalled prowess. One day, a young man awakened into this world with his past forgotten and no place to call home. Follow along as Glenn, by relying on his luck and wit, tries to survive and advance in this unforgiving world. Entangled within the machinations of fate, political schemes, power struggles and wars, he forges his own path and creates a place for himself.

- Description from Novelupdates

Shu Ya-wang is a 28-yr-old landscape architect who is born into a military family. When she was 16 years old, Yawang’s father asked her to take care of 10-yr-old Xia Shu.

Xia Shu had experienced death during his childhood. He stayed by the body of his dead mother for the whole night. This caused Xia Shu to become withdrawn from the rest of the world. Over time, the warm-hearted Ya-wang slowly got through to Xia Shu.

Ya-wang’s childhood good friend Tang Xiao-tian got enlisted into the army after high school, and she later at the university got to know Qu Wei-ran a classmate who eventually turned into a foe. From then on, the lives of Ya-wang, Xia Shu and Tang Xiao-tian, three of them changed dramatically.