Magika no Kenshi to Shoukan Maou - 4.4.1 — Cooperation Attack

Hell Ghost Wang Wannian is born again, smiling and proud!
What?
Are you a soldier, will the tank drift?
You are a master, can you give birth to dragons and tigers?
You are a superman, can you call the wind thunder?
Excuse me, I am not targeting anyone, everyone in my eyes, it is rubbish!

- Description from Uukanshu (translated)

Song Yu, an up and coming architect was supposed to be the fiancée to the second son of the Qi Family… until her family went bankrupt. The engagement was called off and she finally has the freedom to love whoever she wants to! Years later, a twist of fate made her cross paths with the Qi family again. In order to land a prestigious architect role in an upcoming hotel construction project, she had to impress the director of Qilin. Follow Song Yu as she navigates through life and love!

The unparalleled Demon King Ye Xuan, who was able to heal the death or the living alike and holder of the medicine Holy Scripture, was betrayed and killed by his fellow Demon Kings. But he reincarnated into the body of Ye Xuan, the prodigal son of the Ye family and vowed to himself that he would return to his peak and take back everything that belonged to him!

- Description from Novelupdates

Five years ago, she left behind an egg and said, “This is the son I bore for you. When he comes of age, that will be the time of my return.” He thought she was joking, but months later, the son hatched out of the egg, looking like a normal baby but with two shiny, adorably cute little dragon horns on his head. However, she remained far away with no signs of returning.Later, she disappeared for five years, and he went mad for five years, until Little Dragon brought home a woman, and he instantly came to his senses... But Little Dragon said, “Daddy, even though you don't have a wife, you're about to get a daughter-in-law soon. She saved me, and I want to dedicate myself to her in return!”From then on, the father and son found themselves in an open and covert struggle for her affection.“Your Excellency, Miss Si's medical skills have amazed the entire globe, and all the bigshots are busting their heads to court her. Your heroic rescuing act is of no use...”Mo Yinhe suddenly collapsed to the ground, coughing violently, “Quick, go call her to save me!”“Your Excellency, the seven arch-rivals whom you beat until their livers exploded are all Miss Si's biological brothers. They want to take Miss Si back to inherit the throne...”Mo Yinhe immediately announced his abdication, pulling his son to roam the streets: “Sonny, from now on, Dad can only follow you to seek refuge with your wife-to-be.”Little Dragon shook the shiny, adorably cute little dragon horns on his head, “Daddy, I've already arranged a retirement home for you, guaranteed to secure your peaceful old age~”