Sang-hyun and Dong-hyun were born as conjoined twins with two heads sharing one body. For 30 years, the two have lived in a remote house with their father, who tells them not to go outside the property While Sang-hyun is obedient, Dong-hyun is always questioning something and extremely selfish. Dong-hyun secretly reads and practices writing in the hope of becoming a novelist. One day their father learns of out a fact Dong-hyun's dream, he implores Seung-ah, a cheerful and friendly illustrator wannabe, whom he met by some fortuity, to assist Dong-hyun to publish a book.