Should He Save His Mother ?

"system, how does the protagonist know about my identity?" Daniel asked his last question while frowning.

He really didn't care about the protagonist knowing his identity

Maybe with his identity known, the protagonist will be more cautious about him and will not approach him until he has enough power to suppress Daniel.

Or even maybe the protagonist, knowing his real identity, tries to suppress him by using different methods and plans

But Daniel didn't care in the slightest, so what if the protagonist knows his identity? He also knows the identity of the other party and not only that, but he knows almost all his weaknesses and opportunities

In addition, with the knowledge he has of the protagonist's character, Daniel can easily guess all his plans against himself and easily destroy his plans.

What shocked and frowned Daniel was how the protagonist knows about his identity. Who or what caused this?