Waves Upon Waves

There's an old legend in Sereong's family: their flute "Manpa" will turn into a person if you care for it with enough love! But Sereong doesn't believe in this legend and plans to sell the Manpa... But then her Manpa turns into a human and tells Sereong he can grant wishes. A romance between one who grants miracles and one who doesn't believe in miracles. (Source: Naver, translated)