Does Tatsumaki Know About Saitama?

Trying to understand how does Tatsumaki Know About Saitama implies? Find the full explanation with up-to-date information.

In reality, King is the weakest of the S-Class heroes, and likely the weakest hero in the association. That isn't to say that he hasn't developed any abilities and techniques to help get him by. King's “King Engine” is something that his opponents hear whenever confronted by the S-Class hero.