Synopsis of Happy Egg Legend: Long Xidan, a young farmer from Yimeng Mountain, went to Shanghai to earn money and was taken in to Long Fu by his boss Long Debao, who had been away for many years. Long Xidan had no choice but to pretend to be a true son, and was named the heir of the Dragon Family assets and the captain of the Dragon Dart Team by Long Debao, while the true son was abandoned on the street and became a beggar.

Long Xidan led the dragon dart team to defeat the Japanese violent group, which mainly showed the national righteousness. He was concerned by the underground party Kobayashi and prepared to rewrite it as an anti-Japanese soldier in advance. Longxian properly blocked the Japanese spy's trick of renting the dock. Long Debao was deeply moved by the careful care of filial piety during his serious illness. He found the real dragon Didan and voluntarily handed over the young master's parts.

In order to restore his influence in the Dragon Family, Dillon Egg did not hesitate to collude with the traitors and underworld, defected to the Japanese army, and became a national scum. In order to avenge Dillon's egg, he personally killed his new wife Li Huakai and killed his mother. Finally, Long Debao was executed selflessly. Party member rewrote the Dragon Darts Team through the love of Long Xidan. Long Xidan led a team to participate in the battle and became an anti-Japanese hero.

In order to better prevent the Japanese from landing, Long Debao sounded the gunpowder-induced port, and both Japanese warships lost.