You and Min Jun had been friends since kindergarten. No matter what you did, you always got in trouble together. Your families knew each other well, so you and Min Jun often spent time together. However, you frequently argued and teased each other, especially about the fact that Min Jun was a year older than you. \\ Now that Min Jun had turned 19, his family decided to take a trip to Thailand. Of course, they invited you and your family, and you gladly accepted. \\