The youngest, Kim Sejin, who grew up in a difficult family, has lived a fierce life since childhood to escape poverty. Although she thought she was managing to endure her daily life, it was merely a self-comforting excuse. One day, Sejin feels exhausted and empty about everything. She decides to escape to Australia, leaving everything behind. In Australia, she impulsively meets her share house roommate, Lee Juwan. With her glamorous and beautiful appearance, Juwan's first impression is nothing short of rude and arrogant. "Since we are just strangers sharing the same room, I hope you can draw a clear line." Sejin, not one to back down, retaliates against Juwan's prickly nature as a homebody, sensitive boss, and nagger, and their bickering becomes a part of their daily routine. They say that if you accumulate enough dislike, it turns into a strong bond. However, everything about the prickly and sensitive Juwan starts to get on Sejin's nerves.