But he held back. Even though he wanted to point out that Robin was outside the scope of his 'generosity,' he couldn't say it. If it had only been the two of them, he might have spoken his mind. But they weren't alone, so he had to restrain himself. After all, Robin was clearly close to Haneul, and he didn't want Haneul to think he was some insensitive jerk.
Though the logical part of his brain questioned his train of thought, wondering why he cared about the opinion of someone he had just met, he couldn't just ignore what the illogical part of his brain was saying. And it was saying that he should care. It was irrational, and completely out of character for him.