First Love Song** is about Ethan, a young musician, and Sophia, a pianist, who meet in New York and share their passion for music. They collaborate to write their first song, but they face family challenges and life pressures. After participating in a music competition and winning the grand prize, their fame increases, but they face difficulties due to the pressures resulting from fame. Despite this, they remain committed to their love and passion for music, about astronomy. Their friendship deepens into a meaningful relationship as they share dreams and fears. They face challenges from their pasts and learn the importance of confronting difficulties together. After a period of separation due to family circumstances, they reunite and discover their strength in love and friendship, opening new horizons for their future.