Working out how to eavesdrop in Crimson Desert during the Bared Fang quest actually used to be even worse than it is now. Like many elements of the game, it was patched post-launch, but even then, it's not the clearest mechanic. You'll also have to give a bunch of answers to a guard in yet another example of the game's rickety-ass social minigame.
First, I'll explain how to eavesdrop, since you'll have to do this periodically between speaking with the guard. I'll also give you the responses you have to give to the guard after you eavesdrop on each new conversation. Either way, this step-by-step should allow you to complete the Bared Fang quest so you can progress the Chapter 7 storyline.
How to eavesdrop and all Bared Fang answers in Crimson Desert
After you arrive in Beighen at the start of Chapter 7, the Bared Fang quest will require you to eavesdrop on multiple conversations, interspersed with trying to convince a Blue Fang guard to let you inside their secret hideout so you can speak with their leader. Here's how to eavesdrop, plus the steps...
English (US)