A giant rebelled against the heavens. It was declared a devil and defeated. The immortal heart evolved into Sun Wukong. The heavens found him, and ravaged his home. He enters the heavenly kingdom, disguised as a human, seeking retribution.
When Xuan's real estate project threatens the home of mermaids, Shan is sent to stop him. When they fall in love, he is encouraged to cancel the project. However, he must save them from bigger danger.
