Combustor and gas turbine including the same

A combustor, comprising:

• a fuel nozzle for injecting fuel;
• a combustion liner surrounding a combustion space for combusting the fuel, the combustion liner having an internal passage having an outlet communicating with the combustion space;
• and
• an air-fuel mixture line for introducing an air-fuel mixture containing the fuel and compressed air to the internal passage, the air-fuel mixture line being connected to an inlet of the internal passage of the combustion liner,
• wherein the combustion liner is configured to be cooled by the air-fuel mixture flowing through the internal passage.