Dang Nana's ears perked up.
Her expression was utterly serious.
There was no doubt she was using eavesdropping techniques. Eavesdropping is the art of gathering sounds, used to catch distant or small noises; it's practically a skill for snooping around.

The gaze of Dang Jin-cheol, the head of the Dang family, was filled with unease.

Of course, it wasn't new or surprising to see his younger sister acting like this. However, no matter how one looked at it, eavesdropping on the Murim Alliance leader was unacceptable.

This wasn't the playful mischief of the curious and innocent little sister …