Kyungsoo is the son of Fairyland Princess Baekhyun with an ordinary human Chanyeol. Kyungsoo is a very beautiful young man and he is envied by a Queen in the state. The Queen also practices witchcraft and tries to poison kyungsoo but is stopped by her stepson who is also The Crown Prince Kim jongin.

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Continuation of the story part 2,

100  years ago (before Peaches)

According to legend, a mountain  Fairy Princess Baekhyun was born from The Spirit of White Blood Doh Kyungsoo (Part 1 : The Beginning)

She fall in love with a villager named Park Chanyeol who drowned while bathing in a lake by the mountain.

After rescuing the man, she stole his soul and left the man in a semi -conscious state. A shaman was consulted to summon the spirit of the mountain fairy princess and release the spirit.

However, the naughty mountain fairy Princess Baekhyun resisted and said the young man should marry her and live with her at the top of the mountain.

The young man named Chanyeol agreed because he had fallen in love with the Fairy Princess Baekhyun.

Chanyeol brings Baekhyun to his family home without telling the Chanyeol family that Baekhyun is not a human but a Fairytale Princess from The Doh mountain

However, Baekhyun's secret is later revealed and he is forced to return to his heavenly home. She force to  left their son  Kyungsoo with Chanyeol.

Before leaving her son she swore her son's life was tied with a Necklace  from her fairyland.

The Necklace should always be with Kyungsoo. If the his necklace is separated from his body, then the child will be unconscious forever. To awaken Kyungsoo, the necklace shall be worn forever.