My old ride needs to change brake shoe

Hi guys, last night after my old ride started  to trigger its alarm for no reason so i tried to turn it off by its remote key and nothing happened so i decided to open the card and remove its alam fuse, then decidid to start and stroll my old ride which is a mitsubishi space wagon, since it was not being use as our day to day ride going to work, it was stuck for weeks..

I tried to press the accelerator to move and notice my right rear tire are dragging, shift to reverse and its moving but when i put it to 1st gear its stuck again.. i turn off the engine and told myself mybe the brakes are stuck up..

Then morning comes, i remove the tire and check the brake shoe,

Only the caliper was left and the shoe was detached..