Cast:

Yang Seungho as Seo Dong Hyun- a nerdy guy who is into technology. Upon meeting ATHENA0452, he realized how troublesome the world can be sometimes. When he decides to experiment on Athena's body, she was suddenly awakened and became a pain in Dong hyun's neck. To avoid being bullied, he pretends that Athena is his girlfriend.

Han Sunhwa as ATHENA0452- A robot made by a mysterious man. One night he decides to dispose Athena because she was a failure robot. The trash can where he disposes Athena however was Dong Hyun's and he decides to make use of Athena's robot body by experimenting on it. To protect Dong Hyun from being bullied, she pretends to be his Girlfriend.

Jung Jinwoon as Yoon Seong Jae- One of the rich but unpopular kids in school. He met Athena when she was at the cafeteria, and finds her weird for drinking cooking oil. Soon he develops feelings for her, but gets the shock of his life when he knew Athena was a robot.

Woo Jihae as Kwon Yumi- The School Goddess. Every guy on the campus likes her, but she's a snobbish lady, probably because she was born rich and heir to University of Incheon, where she and the rest of the characters (save Jino) studies. She finds herself liking Dong Hyun when he had a beautiful transformation from nerd guy to cool guy. She decides to break Dong Hyun and Athena's relationship, only to find out that it was only fake and Athena is not really a human.

Kim Junsu as Park William- Half British Half Korean hottie. Also one of the popular and rich guys in the campus. He and his friends always bully Dong Hyun, and when he knew that Yumi was liking Dong hyun, he got mad at Dong Hyun even more. Cause you know, he likes Yumi. duh?

Goo Hara as Park Veronique- Also known as Vern. She is William's younger sister. She has a long time crush with Seong Jae. But upon learning that he likes Athena, she planned to make Athena's life miserable. She was the second person to know about Athena being a robot. Soon she finds a new love interest. Read to find out who.

CNU as Lee Jino- Dong Hyun's next door roommate. He is also a nerdy guy, but tremendously rich. Unfortunately, he is not really popular on campus because of his nerdiness. He and Dong Hyun were the only people who knew that Athena was a robot.

Han Sunhwa as Gong Venus- You'll find who she is later on. ;)

Official OST:

Part 1 Official Theme Song Title: If we fall In love- Yeng Constantino and RJ Jimenez

Part 2 Official Theme Song Title: Runaway- Krissy and Ericka

Part 3 Official Theme Song Title: Angel- EXO