"Big Star" tells the story of the honest and straightforward Tae-sik who works as a celebrity agent, but his real dream is to become an actor that everyone pays attention to. Finally one day, he got his chance. Won-joon was a top Korean star and Tae-sik's idol. In order to avoid a scandal, Tae-sik prepared to replace him and turn himself in. In return, Won-joon arranged for Tae-sik to play a supporting role in a TV series he starred in. Tae-sik gradually became a well-known star, and his desires became more and more inflated, which seriously threatened Won-joon's position in the circle. He even began to covet Won-joon's girlfriend, the drama producer Mina. The relationship between the three people became more and more turbulent and ready to explode. Who will finally occupy the throne of the top star?