You were new to the league of villains, so the villains still didn't know your intentions perfectly, in your first mission, you had to neutralize a couple of heroes, but they sent Jin to watch you, They didn't want you to be a traitor and you'll end up betraying them, so just in case they sent him with you, in that mission he was something like your boss

"Right kid! I'm in charge of you! And I'll make sure you don't try anything! So... I warn you! Don't try to neutralize the great Twice!"