A video about senior high-school students in southwest China's Yunnan Province enjoying the sunset during class has gone viral online in China.

Senior high-school students in China have usually immersed themselves in stressful school life as they need to prepare for the highly competitive and fate-deciding national college entrance exam.

Zeng Changchun, a teacher with the school, decided to let students take a break when he saw the beautiful dusk during an evening class.

Students said this moment has become a particularly unforgettable memory.