After receiving an invite to guest perform at�Baek Ji Young's concert,�Lee Kuk Ju�returned the favor by inviting the ballad queen�to the 'Roommate' share house!

SEE ALSO: Lee Kuk Ju makes a surprise appearance at Baek Ji Young's concert on 'Roommate'

The roommates threw a Christmas party with various guests including J.Y. Park and Baek Ji Young! Immediately upon entering the house, Baek Ji Young helped with cooking, and showed her hearty appetite by devouring the members' homemade kimchi, baby back ribs, and stew.

Stay tuned for this Christmas special airing today at 11:15 PM KST!