Woo Tae Seok is a lonely veteran detective. He focuses solely on solving cases. He teeters on a line between good and evil. Tae Seok crosses paths with a female psychopath Eun Sun Jae, but he is unable to arrest her due to a lack of evidence. The woman eventually helps him solve other cases.
After learning that his ex-girlfriend has a fabulous new boyfriend, Hyun Seung spends his nights wracked with insomnia and jealousy. Then one night, a phone call from a sexy stranger breathes new life into his gray existence. Even with her enviable looks and a successful boyfriend, Yun Jung feels love deprived. While attempting to spice up her relationship, Yun Jung resorts to giving her boyfriend a steamy phone call… only to find that the guy on the other end is someone else and she just can’t quit him!