A rare example of the genre Korean Fantasy, the stock characters and clichés of Western fantasy such as elves, magic, dragons and Latin languages are instead replaced by Korean concepts such as dokkaebi, ssirum, and the Arazi language, which is based on Proto-Korean.

1500 years ago, the Nhagas started a 'Great Expansion War' against other races to expand their territories.

The kingdom of Arazi, founded by the legendary Rekkon 'the Hero King', was destroyed after hundreds of years of war against the nhaga.

On the other hand, 'Ryn Paye', a boy who lived in 'Hattengraj', the center of Nhaga society, becomes an adult and participates in Heart Extraction Ceremony.

The fictional world of The Bird That Drinks Tears is inhabited by four major intelligent races - Human, nhaga, rekkon and tokebi.

It is expected that Lee Yeongdo will write two more sequels, because of the quote in the series that mentions four birds.