Can anybody recommend me some korean textbooks for beginner level, please? ^^ preferably available on PDF format

The story of my sorrow It was October 392, the trees from the Royal Garden were painted in the color of the decomposure and a cold wind was replacing the warmth of the evening in Goguryeo! I was taking a walk waiting news from the battlefield were my husband, King Gwanggaeto was leading the army against Baekje. A messenger brought news from the combat zone that His Majesty was badly wounded. I could smell the blood from his soaked jacket and hear his penetrating screams. My eyes started to water and I fell on my knees. Despite the hysterical screams of my maids I remained on the pavement...contemplating...retaking over and over again his vow "we shall live happily ever after, we shall die on the same day, same hour, same moment, not one second difference and continue our existence in the Heaven". I wanted to believe what he said...that he will come back alive...I wanted to believe it so badly... Deeply disturbed I gathered my strengths and I continued walking towards the Royal Court. There arrived, I received news that Goguryeo defeated the army and came home with major losses. I rushed to the place where the king was treated and when I was about to enter the Royal Doctor stopped me, with a mortuary look upon his face he told me that he might not make it trough the night. I panicked and run inside. And there he was, laying on the bed, suffering, fighting the Death Lords...struggling to survive. His Majesty was the moon of my life, the only man I've ever loved and I could not let him leave this world with my heart in his pocket because I won't be able to fall in love again. Therefore, by transposing my story on paper and seeing how the chapters of life link to each other like beads on an endless rope, I still have hope that our undying love would survive and rule over the world of both living and dead....forever. PS: Sorry for the alteration of history in my story(even though that king ruled in that period and fought in that war...but I wasn't there though =))) )..it was supposed to be fun and creative...even so I hope you like it. ^^