The story tells of two people bound together since birth, symbolizing a mythical bird called the Biyi (they share only one pair of wings). They are tied together by a red thread, representing an unbreakable bond. However, an accident separates them, leaving both feeling wounded and incomplete. They struggle to live alone until they finally reunite. Through mutual healing, they ultimately become whole.

The story portrays connection, separation, and finding wholeness through reunion.