The tale of when love surpasses all other instincts.
Koo So-A never knew a great deal on the past of her parents,loved them dearly and they loved one another fiercely was really all she knew for certain until a Goryeo period swordsman appears bearing a multi colored sash and speaks a mysteriously.
Now she gets to witness the pain and courage of two parents who went through over 800 years of the truest form of love for their child.
Sacrifice.