I think they are twins. Him on work is totally different. The sly one trying to sabotage h...

he already said why he ignored him. its cuz he was working and couldn’t run into his friends in front of a higher up. So therefore he had to act differently.

No couldn't be twins, (slight spoiler) in ch10 his people call him vice president and one of them asks him why is he wandering around when the opening is right around the corner and Yeseung replies that even the president (old man) hasn't told him to stop yet.