Harpy

Harpy (하피) is a dogfight expert brought in by Supervisor Shia to compensate for the Wolf Dogs' lack of power. As someone close to Shia, she helps out the Wolf Dogs with her mission according to orders, but also keeps other team members in check as well. Her battle style toys with the enemies with her agile movements.

Background
5 years ago, a rich man received a card from someone. The person who sent the card called herself Thief Prom Queen, and forewarned that she will steal the precious painting that the rich man has been hiding. Although the man tried his best to protect his painting, the thief infiltrated the house with astonishing body movements and precision, taking away the painting like a breeze.

This was the first crime the thief had committed. The thief commited similar acts again, rich people or big businesses thereafter, and although the police tried to arrest her with all the means they had, they failed and failed again. However, this perfect thief eventually gets caught by its tail.

3 years ago, the thief infiltrated a research facility of Vultures to steal a remnant of a rare Dimensional. However, due to her curiosity, she also ended up stealing the top secret document.

Vultures, enraged with her offense, orders their Disposal Squad to trace and hunt down this thief. Although the thief was able to shake off her prey with her Phase Powers, she wasn't able to shake off the Disposal Squad, who used any means possible to hunt her down.

When Prom Queen was caught, she thought that Vultures would hand her over to UNION or the police. However, Vultures decided that Harpy, who had read their secrets from the document, will be instead forcibly placed in a disposal squad instead of handing her over.

A team where Hong Siyoung was the Inspector. Hong Siyoung thoroughly brainwashed the thief, and the thief was reborn as the shadow of Hong Siyoung.

Trivia

 * Harpy went to the same academy as Sylvi when she was younger, but ran away halfway because she found it boring.
 * Before being captured and brainwashed by Shia, Harpy was a phantom thief by the name of "Prom Queen".
 * In Harpy's story, her Black Lamb counterpart is J, from fighting him during the Han High School arc to becoming allies during the International Airport arc.
 * Harpy is the oldest of the Black Lambs and Wolf Dogs teams.
 * During a quest in the International Airport, when Trainer wanted to fight Kalbach Tux while he has the remote, he ask Harpy to lead the Wolf Dogs if anything should happen to him.
 * Harpy's Japanese voice actress is originally Shimamura Yuu, but it was changed to Kuwahara Yuuki on October 2017 with consideration for an anime adaptation.