I also noticed that he acts differently in game, but i think that is just because online games give anonymity!
When I play online my personality tends to become more outgoing/bold than how I talk in real life, because I am acting as the online character I created. I get to be whoever I want to be because no one knows the real me. So I believe that Eunsung, who is already pretty talkative around those he is comfortable with (Jaehyun), is able embrace his talkative side more when he is acting as his online character.
Everyone is different in the game world cuz you feel more free.. you uncousciously change. I do haha even here now i m not the irl me (⌒▽⌒)
Just like other comments said, pretty much everyone is different in game vs reality, a loooot of shy people or lone wolf are like completely different person online. Actually that's pretty much the most realistic part of the story (￣∇￣")
I like this manhwa, but theres is something wich bothering me so much. Is there just for me who think, eungsung have diference personality in game and in the real live? In game he tend to talk much, but in real live he tend to being cool...