Oh Geun-tae (JUNG Woo) is a country boy with a booming baritone who is discovered by aspiring singer-songwriter Lee Jang-hui (JIN Goo) and thrust into the bustling world of Seoul's iconic folk music café—C'est Si Bon. Unwittingly, he becomes the third member of the yet-to-debut "C'est Si Bon Trio" and the begrudging buffer between two rival musicians—the vocal genius, Song Chang-shik (JO Bok-rae), and the heartthrob, Yoon Hyeong-ju (KANG Ha-neul). Amidst the smoke and chatter of C'est Si Bon's youthful clientele, they meet aspiring actress Min Ja-young (HAN Hyo-joo) and find themselves completely bewitched. Will their muse inspire them to create legendary music, or tear them apart before they even begin?