Hey guys i have a problem with my rear brakes. Need some help. 97 manual sportage 220,000kms

The left side feels like it is always engaged. When the car is cold it isn't as bad, but after some driving i notice the problem gets worse. When i try to roll on flat ground i need to give it more to move it. Plus i hear the left rear make noise like i am trying to drive with the handbrake partly on. Back right is fine.

Checked handbrake line under the car and it does move slightly when the handbrake is applied but not as much as the right one.

So i tried to inspect it yesterday by looking in the rubber holes on the backing plate. Once i removed the top centre cover it had brake fluid and black dust on it. A few weeks back i did notice my brake fluid level had gone done to low. Hasn't dropped much since but has become darker in colour.

So i assume the cylinder needs replacing. But i can't remove the drum to inspect it. Been on kiatech site and followed the directions getting it off but it tries to move a little. When i try to move it i think the pads are stuck to the rotor or i may have a lip. So i tried to turn the star wheel by putting a screwdriver in to push the locking part away, but when i try to turn the wheel, one way moves the drum a little and i cannot move the other way. From bottom of star to top moves drum, no movement the other way.

So any ideas on drum removal? Could my self adjuster be stuck? Could my return spring be broken?

Is it safe to grind the drum off? I do plan on getting another one. I think they are original.

Also is this site ok to buy from http://www.carpartsdiscount.com

The dealer here says the brake spring set will be 3 1/2 weeks from Korea. I would assume that this site could get it to me quicker than that.

Thanks guys.