The Mightiest Hero of Black ~My Party Members Betrayed Me so I'll Stick With The Strongest Monster~ - Chapter 16: Black vs. Black Part 1

In a land where no magic is present. A land where the strong make the rules and the weak have to obey. A land filled with alluring treasures and beauty, yet also filled with unforeseen danger. Three years ago, Xiao Yan, who had shown talents none had seen in decades, suddenly lost everything. His powers, his reputation, and his promise to his mother. What sorcery has caused him to lose all of his powers? And why has his fiancee suddenly shown up?

Married for four years, there was no love in the life of Su Ran and Song Ting Yu. They were forced to marry because of Su Ran’s pregnancy. Ting Yu thought Su Ran was a foxy woman that tricked him with a purpose to enter the Song household, that’s why after the night after they both said the wedding vow, he immediately went overseas to be with his love and never came back even once​ to see his son.

Four years later, Song Wei Xi, the son of Su Ran and Song Ting Yu, was diagnosed with a rare illness. Madame Song, Ting Yu’s grandmother, knew this situation was urgent and asked Song Ting Yu to come home to help with this situation. Song Ting Yu couldn’t help but come back home, he came back to face his forgotten wife and child. Su Ran promised Ting Yu that she will sign the divorce paper if he agreed​ to help. Will Song Ting Yu agree with this proposal? Will he still leave after the recovery of Song We Xi or will he stay? Will love start to grow in their family?

- Description from Novelupdates

A man who was once called the world strongest agent ended up becoming a teacher after his retirement to train the new generation of agents. After many years of training his disciples, he is killed at the age of 60 by the ploy of a secret organization and was reincarnated in another world with all his past memories.Though he was surprised by the magic and the strange species of that world, he adapted very fast to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his tight discipline in order to reach his goal: resume his career as a teacher which he left halfway through in his previous life.This is the story of a man who based on the memories and the experiences of his previous life, became a teacher who travels through the world with his new students.

Seven years ago, after their breakup, he disappeared without a trace.