What is the irony in virtually true by paul Stewart?

Virtual means something which does not really exists but only seems to exist. It does not be in the real time and space but only lives in cyberspace. The piece written by Paul Stewart relates the story of Michael Dawson, a school boy who plays psycho-drive and interactive games and discovers in the process of a certain "Sebastian Shultz" who constantly requires saving. Throughout the game Dawson believes that he is just attempting to crack the game while in reality it appears that the real Sebastian suffered from some kind of an accident and his memory was stored in the game. When Sebastian wins the jackpot in the game, the real Sebastian gains his memory and is revived from coma.

So the irony in virtually true can be highlighted as the regular attempts made by Dawson while he is playing the game while actually his trials brought a real boy back to consciousness. In the end of the chapter the protagonist Michael asks whether everything was real or virtual because it seems that both of them are so thoroughly intermingled that it seems difficult to distinguish between the two.