A female spear-wielder, Balsa, is recruited to protect the second prince of Yogo, Chagum, from his own father. The Emperor is determined to kill him, believing the prince is possessed by an evil water spirit.

Chagum returns to the palace and is named Crown Prince and Divine Hero of the People. While Chagum is reunited with his mother, Balsa contemplates the future. Chagum meets with Balsa and wants to run away with her, but Balsa's words give him the courage to stay. Her pledge finally fulfilled, Balsa departs for Kanbal.