Because her older brother went abroad on a business trip, Soeon ends up taking care of his dog, Mango. She brought him home without much thought, but… with walks, meals, and bathroom breaks, there’s actually a lot to take care of. Then one day, during a walk, Mango slips away from her! Thankfully, someone catches Mango right away and returns him to Soeon. But this man… he’s handsome, isn’t he?