Wolf Warrior II, an action movie, has earned a record 3.63 billion yuan ($541 million) at the box office in just 13 days since its release on the mainland.

The box-office receipts are a major vote of confidence for domestic productions and also a reflection of the patriotic mood sweeping the country.

One reason for the film's success is its well-crafted action scenes and use of state-of-the-art weapons. But the military-themed film was able to top the 3.39 billion yuan box office of the 2016 romantic comedy-drama The Mermaid to become China's highest-grossing movie also because its release coincided with the 90th anniversary of the People's Liberation Army.