They were face to face with their guild members and the reason they wanted to fight them was not that they betrayed them. They did not have such deep ties with the guild, it was a source of income for them. They were fighting these people simply because they wanted to.
Hana was not liked by Bae, this was more of a personal grudge but before things could escalate a man walked up behind them.
He had on a white fedora hat, with a Cuban cigarette in his mouth. This man matched the description and he did not come alone, he came with multiple other masked ones, these people have all been sent to kill him at one point or another in time but in the end, they could not say "no" to the money.
Bae and Ae-Cha knew they were in trouble the moment they were surrounded but it was not a do-or-die affair and they were not about to risk their lives for something as trivial as a mission.