Mi-so, a 12 years old girl who transferred from Seoul to Jeju island, meets Ha-eun. They promise never to seperate. At the age of 18, Ha-eun's boyfriend, Jin-woo breaks two girls's friendship. Few years later, they come apart as their lives go seperate ways. Now they are 27, and they finally meet again. They've missed each other. After 15 years, will they truly understand each other?
An aspiring singer Sun-deok is visited by her mother, whom she hasn’t spoken to in years. The abrupt encounter leads to the news of her younger sister Yuri, who had vanished with their savings. The mother-daughter team is now hunting for the missing girl and their money, poking around in Itaewon, the international hub of Seoul. Little do they know that soon they will be faced with Yuri’s unlikely secrets.
