Ren (played by Tori Matsuzaka) and Xiu (played by Masaki Suda) were born into a family of doctors. Their father is a highly respected doctor who hopes that his two sons can inherit his career when they grow up. However, the rebellious Ren does not have the benevolence of a doctor. He loves music and formed a band. He was spotted by a music agent during a performance and decided to officially debut as a singer. Ren's decision caused a fierce quarrel between him and his father, and finally, Ren left home resolutely. During the days when the relationship between his brother and his father dropped to the freezing point, the gentle Xiu was preparing for the exam hard. With not excellent grades, he finally chose the dental university as his goal. Ren's music journey was not smooth, and various conflicts of interest also created a gap between him and his teammates. Xiu, who was successfully admitted to the university, suddenly discovered the comfort and strength that music brought him after picking up his brother's guitar one day.