That's not very in character for him to recklessly attack like that. As much as chung myung looks like a meathead, he thinks before he acts. I don't believe he'd just jump in like that.
@Viewer 7 I don't think you're reading the right manga because in the flashbacks that's how he is. It's also the reason he's senior brother scolds him everytime
@First and foremost but it's because he doesn't really try. Like how he invented a way to unnintoxicate himself just cause he didn't wanna be caught. He knows what he's doing.