SUN rushes to Dragon Castle to save MOON. However KAM FA and NGAN LAU’s flying apparatus cannot accommodate all of them. Therefore SUN leads the way alone. SIN YUNG is afraid that SUN"s heart will be polluted, so he sends HEUNG YEE to protect SUN. NAM KUNG POK knows that SUN is on his way to save MOON. He instructs SING to take SUN's essence. He sends subordinates to lead SUN to his castle but his plan is spoiled by HEUNG YEE. HEUNG YEE does not want SUN to risk his life. She lays a trap to keep him behind bars. Later she realizes his eagerness to save MOON, she releases him. SUN arrives at Dragon Castle. With HEUNG YEE's help, he becames invisible. However he is defeated by NAN KUNG POK. NAM KUNG POK forces SING to suck his essence.