Milcha is a South Korean writer known as the original creator of the web novel Why Raeliana Ended Up at the Duke's Mansion. This romance fantasy series began serialization on the digital platform KakaoPage on September 19, 2016. The story follows a woman who reincarnates as Raeliana McMillan, a minor character fated to die, and seeks to change her destiny by entering a contractual engagement with a powerful duke.

The popularity of Milcha's original web novel led to a webtoon adaptation illustrated by the artist Whale, which was first serialized on KakaoPage on September 3, 2017, and ran until March 22, 2021. This manhwa adaptation was later published in print by Yen Press in North America beginning in 2022, with each volume crediting Milcha as the original story author. The work was further adapted into an anime television series produced by Typhoon Graphics, which aired from April to June 2023. In the anime's credits, Milcha is listed as the creator of the original web novel and manhwa.

Writing under the pseudonym Milcha, the creator is noted for emotionally engaging stories that blend romance, fantasy, and elements of wit and mystery within richly built fantasy worlds. Beyond the Why Raeliana Ended Up at the Duke's Mansion series, Milcha has also reportedly written other works including Taming My Master Mage, Dungeons and Crayons, and The ChickClass Hunter Is Being Filial!.