We know she gave the mysterious money? That must have been in one of the many scenes I missed due to bad reception/tape snafus. I haven't seen more than a handful of full episodes yet.
In the beginning of the first ep, we see her go to the desk of the hotel where Sang-hyeon and Eun-ju ar getting married. She drops off an envelope, and leaves. Later, the family is going through the wedding envelopes, and finds one that's unmarked, with $10,000 inside.