Kang Soohwa's luck takes a turn for the worse as he seeks a part-time job to make ends meet, only to end up drenched and unconscious while on the hunt for free wi-fi. Upon awakening, he finds himself face-to-face with Go Yohan, the manager of Cafe Goyo, and his employee Oh Gyoon. Despite initial reluctance, Soohwa pleads for a job and is reluctantly taken in by Yohan despite Gyoon's objections. To his surprise, Yohan is deaf and communicates primarily through sign language, a skill Soohwa must quickly learn. As Soohwa grapples with his newfound attraction to Yohan's voice and strives to master sign language independently, Yohan offers to guide him. Little does Soohwa know that this gesture will entangle them in a relationship far more complicated than he could have anticipated.