Mimizuku to Yoru no Ou - Commentary - Hiro Arikawa

This is the story of the youth Wen Leyang, born into the family with an expertise in the cultivation of the Art of Poison.

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

As someone who had always aspired to live a laid-back life, Xu Lin received the news of his hometown’s old house’s demolition at the age of 24. As a result he would be compensated with about 5 million. But before he could grasp the feeling of being a second-generation displaced person , he blinked and found himself back in the green years of being 17.Now, he had to embrace the “salted fish” state once again and wait for another 7 years. Despite his initial thoughts, a peculiar thing happened due to a confession incident, disrupting his plans.[Congratulations Host on activating the Twelve Zodiac Love System!]Thus his fate became entangled with 12 different types of girls…

This is a story of a man named Kim Sae-Jin, who one day, inexplicably wakes up as a Monster. Follow him and his perilous journey to get his life back as a Human, all the while growing even more versatile as a Monster in the process. This should be… complicated, somewhat.