Jang Tae-joon

"불가능한 것을 손에 넣으려면 불가능한 것을 해야지."

 is the protagonist of Chief of Staff. He is an appointed lawmaker's assistant who works at the National Assembly. He succeeds in making his boss leader of the party but, as an ambitious man, he wants to achieve more in the political world. However, to accomplish his dream, he must deal with hurdles expected to block his way.