Instead of calling her boyfriend, Yoon-jung accidentally calls a total stranger. But she feels comfortable with him, and ends up having phone sex with him. Then when her relationship with her boyfriend is in trouble, she gets to meet Hyun-seung, who still loves his ex-girlfriend. Yoon-jung falls in love with him, but finds out that Hyun-seung is the very stranger she's been having phone sex with.

Yoon-Jung (Kim A-Joong) accidentally calls a stranger, instead of her boyfriend, and has phone sex with the unknown man. When Yoon-Jung's relationship with her boyfriend turns sour, Yoon-Jung meets Hyun-Seung (Ji Sung), the stranger she had phone sex with. Yoon-Jung falls in love with the man ...