They used to be lovers who loved each other, but they missed each other for 7 years for the person they cared about most. The love left in each other's youth is a belief they can no longer forget. Seven years later, when he returned to her with a successful career, love became an unbreakable bond between them. The multiple tortures of life overwhelmed her and made him deeply painful. Their fate eventually turned them into the most painful scar in each other's lives, which they can never forget.