A mystery drama about warm friendship and humanity unfolds when Dong Joo, a passionate young man who only has debts, meets Kang San. Yook Dong Joo is an aspiring writer with an ambitious dream of becoming a best-selling author someday. A disharmonious romance begins when a mysterious unidentified boy, Kang San, falls into his life. Kang San has amnesia and can't even remember his own name, but he has the special ability to hear other people's hearts.