Good Night, My Dear Kafka [On Indefinite Hiatus]

Growing up in one of the small neighborhoods in Seoul, the kind-hearted dancer Park Jimin and mischievous singer Kim Taehyung used to be good friends with each other and 5 other boys who shared their passion for music. They thought that their friendship would last for life, but unfortunately, it didn't happen. 2 years ago, Taehyung suddenly left everyone without a word. Nobody knew what was wrong with him for him to leave abruptly like that, not even Jimin. Even though he thought he knew everything about his 'eternal' classmate and best friend, he actually didn't know anything about his life.As months passed, the group of good of friends drifted apart from each other. The months became a year, then a year became two, and time went by without them being able to get together with their full members. However, Taehyung suddenly appeared out of the blue-- trying to reunite everyone again and even persuading them to go on an impromptu road trip together. However, Jimin was confused because his best friend acted like he never left, and remained the same like he was back in the days. What was Taehyung actually hiding, and what other things happened to everyone else when he left them?