@WillLi Let's just agree to disagree. I get that you have a problem with us readers not witnessing the moment he "loses it". But that's what makes him snapping in this chapter so impactful. We've already been given all the elements needed to explain his breakdown.
This is not just the product of him losing the fight against Youn-joon, it's about all the losses he's been takin since he joined the fight classes. It's about him giving his all in his training and yet coming up short every single time. It's about him trying to stick to his beliefs just to fail all the same. It's aboutMaria, his mentor and the person he looks up to, humiliating him and calling him out for being himself. The scene with Maria and the scene at the hospital are big enough for us readers to understand the level of frustration and despair Jiu Ji-tae has reached.
We also have to take into consideration that there was some time between the fight, the exams, and what's happening right now. Also, there's a big possibility that Ji-tae is forcing himself to act this way in order to "toughen up" and meet Maria's expectations, as well as to fight without any type of restraint. That's why I don't have any problem with the reveal being this way.
So it's not like I don't see your point. I just think it works perfectly fine this way. Not everything needs to be spoonfed to the readers.