One

A normal teenage girl, but having a disaster life when her dad, divorced with her mom because of another woman. Not just that, her dad took her mom's money and no ammount left in the account.

Nobody can help this family, her mom doesn't have anyone to ask help with. Every night and day, her mom wom't stop working, leaving her two children at home and worked hard to gain money.

Until at one point, Choi Ahyoung (the main character) can't take it anymore and decided to meet up with her dad, discussing about this.

That's when everything started, and unexpectedly, ahyoung asked a guy, a hacker to help her in this case.