Romantic Fool vs. Ambitious Fool | The World Calls Us 'Lacking'. Daehan (Choi Sung-guk), originally surnamed Park, changes his surname to Kim because he loves seaweed so much. He lives his life diligently with his only best friend, Minguk (Gong Hyeong-jin), another fool, while working part-time at a car wash. Daehan's sole hope and wish is to marry Ji-eun (Choi Jung-won), an angel-like friend who has watched over Daehan and Minguk since childhood. For the sake of his beloved Ji-eun, he draws a crosswalk right in front of her hair salon so she doesn't have to walk too far, and moves the bus stop to be closer. He is the greatest romanticist in the world of fools, giving everything without hesitation for his beloved. Minguk, who actually likes seaweed but decided to become surnamed Kim with Daehan because his smarter friend likes seaweed. Even while working part-time at the car wash, he is the most ambitious person in the world of fools, dreaming of being a pilot yesterday, a taxi driver today, and a boxer tomorrow, as there are so many interesting things in the world. He relies on and admires the smart Daehan, who can figure out why jajangmyeon is 500 won cheaper than jjamppong. Because he admires him so much, he feels a bit tired having to do everything Daehan says, but he always feels happy to have a dependable friend by his side. One day, while getting a haircut at Ji-eun's salon, Daehan and Minguk face the biggest upheaval of their lives! Ji-eun casually says to a soldier customer getting his hair cut, 'Don't men become true men after serving in the military? A soldier is the best groom of the first class.' Daehan decides to become a true man and the number one groom for Ji-eun. He ignores Minguk, who tries to hold him back to go tomorrow, and the next morning, he heads to a nearby unit without hesitation, but!!! He is ruthlessly kicked out for not meeting the educational requirements. Minguk consoles the hurt Daehan, and they decide to go together after Daehan passes the equivalency exam. Will the quirky project of the Daehan and Minguk couple succeed?