ProudMonkey

Shin Kinghad is a kid that had been abducted and trained by a powerful underworld organization since he was three years old. After six years, he was rescued by the Special Forces during their operation against that organization and was adopted by the captain of the Special Forces.

Since then, he treated the son and daughter of the captain as his own brother and sister. 

Years later, he joins the greatest VRMMORPG of all time, [Destiny's Fate] online, due to repeated invitations from his brother. He creates havoc inside the game as he climbs his way from being a beginner player to a peak class expert. 

But as he grew up, he became curious about his real identity and his biological parents. He tried to investigate it with the help of his brother and best friend. And after discovering his real background, he decided to follow in his father’s footsteps and stood at the peak of the world using his Martial-Art Skills and Mentalism Techniques.

Child of Destiny

Shin went back to their house completely exhausted as he really couldn't understand his seniors from the research department. After the 'introduction' earlier, all of them asked Shin to have a quick match against each of them as a form of welcome party for him who just joined their department.

The tone that they were using when asking him was quite polite, making him think that he could refuse their invitation. But when he showed some sign of refusing them, those seniors suddenly put up a creepy smile that seemed to be warning him to reconsider his decision.

Helpless, he could only nod his head and agree to them and had a quick sparring match with each member of the research department. But he would surely not let himself get bullied one-sidedly and put up a good fight. Though, it only lasted until his seniors took him seriously.

Grand Disciple?