This song is from the Korean drama
"My Nine tailed fox girlfriend".
I`m currently practicing its piano version.
This drama made me cry and laugh at the same time.
On one day after Cha Dae Woong ran away from his grandfather, he accidently freed a nine-tailed fox who was closed in a painting for about 500 years. He didn't realize what he has done, until the Gumiho (nine-tailed fox),who took the form of a beautiful woman, appeared in front of him. Dae Woong was really frightened that he ran away from her and fell on the riverbank.Since he was severely injured, Gumiho came to save him and gave him her most precious bead to share with him the mystic fox' strength, as she owes him her freedom. Gumiho then asked him if he can help her become human and how to act like one. In return, she allowed him to use her bead for him to shoot for his dream action movie despite his body's severe condition. As time goes by, their mutual relationship grew deeper as they start to fall for each other.