Plot holes upon plot holes upon plot holes

mysterious disappearance of Won bin, near unlimited supply of depleted uranium bullets, prisoners alive without food and water for a month, aliens who decimated entire battalions of soldiers getting massacred by barely trained students & finally a dude who went manic not cause of war but rather due to CSAT and decides to massacre all of his friends. I don't know what to say... The first season had plot holes but was enjoyable. But this second part is a mess in every sense. Only thing i can praise are the graphics and the acting of the actor. Actors really did an amazing job. Music in this drama was a bad match for the theme of the story.

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