"Crazy Waiting" follows four different couples as they deal with the separation caused by the men serving their mandatory military duties. First couple is Won-Jae (Jang Keun-Suk), a college student, and his older girlfriend Hyo-Jung (Son Tae-Young), who works as a physical therapist. Second couple is in the same music band. Bo-Ram (Jang Hee-Jin), is the shy keyboardist and Min-Chul (Danny Ahn) is the band leader. The third couple is Jin-A (Yu In-Young) and her faithful boyfriend Eun-Suk (Kim San-Ho). The fourth couple is Jo Bi-Yang (Han Yeo-Reum), who lives at her boyfriend Heo Wook's (Woo Seung-Min) home.