Yoon-hyeok has a younger brother who suffers from an incurable illnesss. Yoon-hyuk is asked to be Yoonjae's guardian and he raises him for 15 years. However, as Yoonjae grows up, he tries to break away from the is sibling brotherhood, and Yoon-hyuk sees his younger brother masturbating on the CCTV set up to monitor Yoonjae....