Plot
In unit 5446 of North Korea for dispatches to the South for special operations, the best elite agent, Won Ryu-hwan, who has been selected out of 20,000 candidates, Lee Hae-rang who is the son of one of the highest executives in North Korea and has abilities on a par with those of Won Ryu-hwan, Lee Hae-jin, the youngest spy sent to the South from North Korea -- these three persons are the legends of unit 5446. However, the roles given to them dispatched to the South with the great mission, the unification of the country are amazingly, a fool, a potential singer, and a high school student on a poor hillside. Time passes without any command delivered to them, and they become accustomed to their daily life having troubles with people on the poor hillside, the lowest class in South Korea. Then, one day, a completely unexpected, secret, and great mission is given to them.
