Of Mf

When Jin Shihyun is told by her father to pick up a guest from America at the airport, she rips down a poster of her enemy,(who is also her cousin) Seo Yu Jin's poster, she argues with a mysterious boy. To make things worse, the boy steps and break Shi-Hyun's new and expensive cell phone and runs away! Shi-Hyun chases the boy only to find out that he is the guest from America....

(Source: Baka-Updates Manga)