The Defects

After being disowned by their adoptive parents, Ah Hyun and the kids live as if they are dead; they endure brutal training, determined to protect themselves; Tae Sik makes a bold decision to save a new refund target.

Ah Hyun and the kids try to run away as Tae Sik has planned for them; however, Jung Hyun, who had been keeping an eye on them, picks up their trail, putting them in danger.

Han Cheol Soo, So Mi's adoptive dad, unwillingly gives up crucial information regarding the refund system and the VIP membership to Ah Hyun and the kids; meanwhile, Se Hee embarks on a fishy project involving the First Lady.

To end the adoption and refund system, Ah-hyun and the children confront the organization's leader; they infiltrate the bunker to strike from within, using a carefully crafted plan and determination.

The kids risk their lives to save their guardian, Ah-hyun; to do so, they need big money, forcing them to confront Ju-an's adoptive father; Se-hee's ambition pushes her towards devastating choices that could change the world.

Framed for murder, Ah-hyun and the kids turn to the only adult they trust, Detective Choi; the unexpected return of of Seok-su, the adoptive son who was believed to be dead, throws Kwon Kang Man into a crisis.