Song Mancang, an honest farmer, was born with an exceptional singing voice, but his overly honest nature made him the laughingstock of the entire village, including his own older brother. When he unexpectedly gets a chance to compete in a singing contest, his wife sells her dowry to support his dream. At the preliminary auditions, his very first note amazes the entire audience. He advances all the way to the provincial competition, wins the championship, and becomes an online sensation known as the “Sweater Brother.” However, his sudden fame sparks jealousy. After Mancang refuses to endorse fraudulent products, unscrupulous businesses maliciously smear his name, causing him to lose his eligibility to perform. Yet Mancang never forgets his original dream and continues helping others. With netizens voluntarily stepping forward to clear his name, the mastermind behind the smear campaign is arrested. Mancang makes a triumphant comeback and steps onto an even bigger stage!