"Jummy, mark my words, if a person can't control his appetite, he is not going to succeed in anything at all!"

10-year-old chubby Jummy travels to Hong Kong from the US with his aunt to attend a four-week summer course to lose weight. During his stay in Hong Kong, he encounters all sorts of funny and weird people, and becomes friends with his fellow classmates. Among them are the funny Adrian who always craves food, and the lovely and shy Jummy Girl who blushes all the time. Will Jummy succeed in losing weight in the end?

In this and six other short stories, each of the protagonists runs into difficulties of his or her own. Yet their goodness prevails and the endings are mostly interesting and happy.