Singer Hyolyn (효린/김효정) who is best known as a former member and leader of girl group Sistar (씨스타) and their sub-unit Sistar19 guest stars in "I Live Alone" (나 혼자 산다). Hyolyn lives with her 3 cats, a male Russian Blue named Leno (리노), a female Silver Bengal named Lego (레고) and a female stray cat named Heungnyeo (흥녀). As a person who once dreamed of becoming a zookeeper due to her love of animals, Hyolyn devotes most of her free time to looking after her three cats and volunteering at a rescue centre for stray cats.
