Jonghyun and Key were the best of friends. Everyone knew they were a team that nobody could separate. Jonghyun and Key both were in love with each other, yet neither knew they shared the same feelings. After Jonghyun moved to the United States for his father's job, Key feels depressed that he never confessed his love for Jonghyun. After a couple of years, Jonghyun moves back with his new girlfriend. Key who works at a grocery store, during the time finds Jonghyun and is reunited. Key finally discovers that Jonghyun's heart is taken. He tries to move on, but all fails. He just can't stop having feelings for his beloved Jonghyun. Key then quits his job and works at a post office. One day, Key meets Jonghyun's girlfriend at the post office, delivering mail for her mother. Key  eavesdrops and finds out what truly happened with Jonghyun and ___ ( Jonghyun's girlfriend). Key warns Jonghyun about what he heard, which leads Jonghyun getting very angry. Jonghyun then decides to ignore Key for a long period of time. Key finally learns that he's been making Jonghyun's life worse and makes a final decision at the end.