Baekhyun moved only the day before to his new apartment with his dog Mongryong. If he goes out in the next morning to buy some groceries, he noticed a boy in the next house at a open window. A beautiful and lovely looking boy with a cat. Baekhyun immediately wants to know more. 

Minseok, a botanist, inherits his father's mansion and decides to continue his research there. But he is surprised with the odd things that come with it, and how small they come.