Most girls wants a Prince Charming to come and save them (from their boring life or just save them). Although realistically, knowing that they don't come that easily. 

Unfortunate as she was; she encounters an arrogant handsome looking boy, who has just entered her school. Instantly catching every girl's eyes, he becomes well-known at the first day. Judging from the way he acts– quiet and unsociable yet popular– she tries to avoid him as much as possible. The fact that people crowded around the good-loooking guy was too troublesome for her. 

Accidentally meeting a famous restaurant in Gangnam; she unintentionally gets involved with his issues. Due to this, she has to pretend to be his girlfriend. Turning into a long term thing: everything becomes more complicated; from climbing up her bedroom window to secret being unvealed.

"You're mad!" I sceamed. Walking off, he held grip on to my wrist, forcing me to face him once again. Again I refused, "I am not doing this"