He doesn't remember me

"Who are you?"

This question immediately stunned Mr Sun. What did this boy just say? He asked who he was? As if they had not met before in the past.

He was practically the reason he was such a big thing today. Yet he was asking who he was?

The look he had on didn't look like he was joking. He looked confused and curious. 

Then, he suddenly realized what might be going on and it was shocking.

"Ah!" He exclaimed and covered his mouth. "Don't tell me." 

He took down his hand, ready to confirm his realization.

"What was the last thing you remember doing?" He asked. 

"I attended classes with Sun-bae and then... " He paused, unable to recall the rest. 

Mr Sun's eyes widened and he turned around.

'Yes, head injuries do lead to this once or twice but he really lost it? And to such an extent?' he thought about this. 'This is bad.'

"Sir?"

Mr Sun turned back to him.