As December approaches, many may be reminded of the Hollywood blockbuster 2012, which set Dec 21, 2012 as the crack of doom.

When Wu Zhiduo and Weng Xiangyu quit their jobs in September, announcing they were going to shoot a documentary about people's last words on doomsday, most people thought they were crazy.

"It does not matter if doomsday is true or not, we need to make a change. We should treat every day as if it's the last and cherish it," says Wu, 24, a composer and sound engineer in Gansu province, who was earning a monthly salary of 6,000 yuan ($963).