The Group B tournament began on 12 March 2007 in Miercurea Ciuc, Romania. Australia, Croatia and Lithuania all returned to compete in the Division II tournament after missing promotion to Division I at the previous years World Championships. Serbia made their debut appearance in the World U18 Championships after replacing the Serbia and Montenegro men's national under-18 ice hockey team, the change in team coinciding with Montenegro's declaration of independence and the eventual split of the State Union of Serbia and Montenegro. South Korea entered the Division II competition after being relegated from Division I and Romania entered the tournament after gaining promotion from Division III at the 2006 IIHF World U18 Championships.