Ok here's what you need to know for Hard Mode:
Start the fight and shoot the center cannon (that's where the ship starts). The ship's targetting systems will be disrupted and it will fly away.
*****CRITICAL*******
Jindo will gain a blue absorb shield. You have to DPS this down before the ship returns to start firing on you. Using the cannons while Jindo has the blue shield on himself will do nothing to the ship and it will eventually kill you.
*****CRITICAL********
Tank Jindo whenever he wants to stand. The critical ability to interrupt is Flame Sweep as it does a lot of AoE damage to the group. Everything else can be ignored.
After you DPS through the blue absorb shield that Jindo has the ship will come back (or before you finish if your DPS is slow). Shoot it and it will go away. Rinse and repeat until the ship dies (5 shots should kill it).
Don't be alarmed if Jindo Grapples you when you try to click the computers. Send 2 people after the computers to fire the guns when the ship comes back.
Hard Mode Fight:
Begin by dpsing the boss, and after a short while he will bring his ship into the fight. The ship will physically get closer to the platform letting you know that it can be attacked. Click the gun turret that the ship is closest to as soon as possible. The longer it takes for you to shoot it the stronger the ship's missiles will get. Once the ship has been shot the boss will put up an absorption shield on himself that you need to dps through. Once the shield is down the ship will come back into the fight. Again, click the turret as fast as possible, and then begin dpsing the bosses shield down. After 4-5 rounds of this the ship will be destroyed and you can freely dps the boss before he enrages. The boss does annoying things like stuns and pulls while you are trying to click the turret so it isn't a bad idea to have two people try to click.