MBTI: ENTJ The owner and butler who raises Lili and Samsaegi. Since he is the character who explains things through actions and words in the BEMYPEt videos, he has the highest frequency of appearances. He is very knowledgeable about the information needed to raise pets, but because he adores and loves Lili and Samsaegi so much, he often ends up getting into trouble by getting on their nerves. As you can see, he has no hair at all, so he is often teased for being bald or having hair loss. Below are episodes resulting from Woojuin's hair loss. Lili calls him 'Master,' but Samsaegi just calls him 'Butler' regardless of his name. This is the same on the English channel.

A calico cat. She always adds 'nyang' or 'ong' to the end of her sentences. Basically, if something isn't to her liking, she resorts to irritation, biting, and punching first; however, if her companions like Woojuin or Lili are having a hard time, she is the first to step up to worry and help. She doesn't show it, but she actually has a strong tsundere streak, wanting the owner's attention and love more than anyone else. She enjoys being alone for a short while, but gets very worried if Woojuin doesn't come back for a long time. She is often seen playing pranks on and teasing Lili, the dog living in the same house, but since they live together, they get along well and she takes good care of him.

Lili is an ivory-colored Retriever dog character. He calls Woojuin 'Master~' and has been drawn with bangs since the '4 Signals Dogs Send When They Love Me' episode. For reference, Lili is also the name of the character who helped Samo in the second episode of Samo Story when Samo was sad because it felt like his owner had been taken by another cat.