"Ah…"
Yaana blushed profusely hearing Ryu's question. This was in part due to her outburst from earlier and another part due to the fact she had subconsciously hid this matter from Ryu earlier.
The reason she was embarrassed by the first was self explanatory, but the second left her feeling a bit guilty. She didn't want to deal with the weight of the Necromancy Guild so she had adopted the mindset of 'out of sight, out of mind'.
She hadn't told Ryu about her master because she was afraid that he might see her as a burden as a result.
In the martial world, this wasn't a very rare thing. Being taken in as a disciple was akin to becoming another's son or daughter. While this came with a great host of benefits, it was also saddled with many responsibilities as well. With those responsibilities came obligations that made it difficult for Yaana to do what she wanted, whenever she wanted.