Ren Lancaster is now the one who holds Frostville, a kingdom at the south near the werewolves' kingdom. After raising rebellion and killing the king, he proclaimed himself as the new king. At that time, David was there and he protected the princess he was fond of. But with Ren's dark magic, the people in Frostville were no match to him.
Ren has also mastered the power of manipulation and manipulated the princess to fight David. With the princess under evil influence, David couldn't bring himself to fight back and hurt her. Ren had the opportunity to seal David's soul with his soul sealing sword—the sword that could put even the most powerful person into endless sleep. Though his body will remain unscathed as if he's alive, he will never be awakened. Ren purposely did that because he wanted it to remain a proof of his dominance, a reminder of what he's capable of. That's why he put David's coffin in the heart of sacred mountain where no one could enter.
