Forever , which was featured in the series ' ending during the concert of his character Kang Min , sold over 700,000 copies , and became the title song of his debut album .
Star in My Heart likewise kick - started Ahn 's music career .
Forever , which was featured in the series ' ending during the concert of Ahn 's character Kang Min , sold over 700,000 copies , and became the title song of his debut album .
Star in My Heart likewise kick - started Ahn 's music career .