A peculiar apartment inhabited by "little monsters" from various planets: Diudiu, who starts things with great enthusiasm but often leaves them unfinished, yet is warm-hearted; the elegant and noble Miss Meizi, who always loves to make venomous remarks; Youyou, naturally curious and utterly unable to resist delicious food; Xiaoqi, whose behavior is eccentric and always shrouded in mystery; twin brothers who look alike but have completely opposite personalities; and the landlord, Mr. P, who appears cold on the outside but is warm inside. Every day, new and interesting events unfold in the apartment, as the little monsters experience a unique kind of "cohabitation" life. Through the ups and downs of daily life, they reflect bits and pieces of reality, bringing a knowing smile to the faces of busy city dwellers as they watch.