The story tells about Cat (played by Angela Tse), the lead singer of BandFour, who is determined to step onto the international stage. She has idolized her guitarist father King (played by Teddy Robin) since she was a child, but her father ran away from home when she was ten years old. More than 20 years later, Cat's mother passed away, and the father and daughter reunited in the crematorium. At this time, Cat has a 9-year-old son Riley (played by Chen Nuoting), and her father King brought back his daughter Lexian (played by AnnahisbbuR). The four of them suddenly lived under the same roof, four different voices in one home, each with its own struggles, secrets and fears, making it difficult to communicate. Music is the only thing in common among the four. When the four of them began to tune in and listen to each other through music, BandFour faced even greater difficulties...