An outcast at school, Chao Lung-chieh takes solace in his grandfather's company. However, after the two have a fight, things go from bad to worse.

With his friendship with Lung-chieh on the rocks, Jen-yu discovers his true purpose for coming to land and devises a plan to make Lung-chieh happy.

Lung-chieh’s confidence grows as he learns to swim with his friends' help. Chiang-chiang learns a shocking fact and hatches an ominous scheme.