I came to this video after watching a girl working so hard to walk when she's having hereditary spastic paraplegia (HSP). She was crying because she's so tired of walking (and she can't walk like a normal person). And then her mom keep pushing her telling her she can do it and she can take a rest for a while. Her mom coax her with this song, her favorite korean song. So the music stuck on me seeing how this music and her mom pushing her gives her the strength to keep moving on.