A struggling actress agrees to a fake marriage with a wealthy heir to help him hide his homosexuality, but their plan is threatened when his ambitious younger brother grows suspicious and seeks to expose the truth.
Following the crew at the fictional company Maccom, where they navigate the chaotic battlefield common to Korean start-ups. Steve is the slightly mad mastermind behind Maccom, while Ashley is on the innovation team and is one of his smartest employees.
Gil Oh-so, an employee at a cleaning company, meets Jang Seon-gyul, the boss of the company. The two are diametric opposite when it comes to cleanliness. With the help of Oh-sol, Seon-gyul faces his mysophobia and falls in love with her.
Based on the longest-running web-based comic series "Ma Eum Ui Sori" in Korea, "Sound of your heart" is a story about Cho Seok, an aspiring comic writer, and his strange family.