Drum washing machine and fixing device for drum washing machine

A drum washing machine comprising:

• a housing having an inlet on a front surface;
• a tub inside the housing;
• a drum having an opening corresponding to the inlet and configured to be rotatable inside the tub;
• a pulsator inside the drum, coupled to one side of the drum along a front and rear direction of the drum, and configured to be rotatable independent of the drum;
• a drum stopper configured to couple the drum to the tub so that the drum is locked;
• a holder configured to detachably hold an object to the drum;
• and
• a processor configured to control:
• an amount of water introduced into the tub for washing the object until a water level in the tub is located below a center of the pulsator,
• a rotation of the drum,
• a rotation of the pulsator, and
• the pulsator to agitate the water inside the tub while the drum is locked by the drum stopper based on the holder holding the object to maintain a position of the object in the tub.