133 The Unruly Group

What is the most crucial quality for a spy? Is it the ability to lie convincingly, the talent to blend seamlessly into different environments, or the skill to change one's identity? While all these attributes play a part, the paramount quality for a spy is the ability to conceal their emotions.

A spy must never reveal their true feelings, fortifying themselves against any emotional impact; this is what distinguishes a remarkable spy.

However, just moments ago, Professor Joshua had let his true emotions slip. It was a fleeting lapse that lasted only a second before he resumed his usual expressionless demeanor, but it had not gone unnoticed. Those around him were left utterly astounded.

'Professor Joshua can show emotions?' Eren whispered to himself, his voice barely above a murmur.

'Did I really see that, or was it my imagination?' Elric mused, his brow furrowed in confusion.