Going To The Troll's Kingdom summary:

On the night of her grandfather´s funeral, Hwang Keum Lin saw a thief trying to steal something in her grandfather´s house. She chased after him trying to catch him before he took away anything valuable but he disappeared like magic. Her cousin did not believe that there was a thief no matter how hard she tried to explain. Luckily nothing was missing. However, what could the thief be looking for and how did he break into the strongest security system that money can buy? Little did Hwang Keum Lin know, this is just the beginning and her life will turn upside down, starting from that moment and everything she thought she knew might not be so...