"He is the former kind of person and I'm the latter."
Luo Ran didn't have any ability and was arrogant so he was timid. Ye Jian had the abilities but she wasn't arrogant. Thus, she was a bold person. She was capable and bold. It was just that during normal times, she would disguise herself perfectly so no one realized that she could kill people.
This explanation caused Xia Jinyuan to laugh heartily. It was indeed the case. People who had the ability to kill other people, for instance, he and his comrades, would normally hide their capabilities because they didn't want people to notice them.
People that say they want to kill someone or get rid of someone all the time are delusional. They were disillusioned because they didn't have the ability. People who had it didn't have to think about it. They could just act directly.