Aiden a 16-year-old boy who has been working multiple jobs since he was 10 years old, he has been working to pay off his parents debt who one day abandoned him to go to Las Vegas which is known for gambling. Aiden is always being chased since that day his parents abandoned him, by the loan sharks they are indebted to. He is unable to pay the debt and on top of that he discovers he has a sister, while running away from the loan sharks he meets a girl called Soojung, a young 13 year old girl who is the successor of the wealthy Jung's Corporations. Soojung also referred as Krystal ends up falling in love with Aiden. After he rescues her from the  Kkangpae, she hires Aiden as her butler to repay him.

Word definitions:

Loansharks: illegal money lenders who charge high money rates and interest. 

Kkangpae: Korean thugs