Mi-young shows her boyfriend, Soo-hyun, to her two sisters. However, the sisters feel weird after the meeting, since both sisters immediately fall in love with Soo-hyun.
| Actor | Role |
|---|---|
 Lee Byung-hunChoi Soo-hyun | Choi Soo-hyun |
 Choi Ji-wooHan Sun-young | Han Sun-young |
 Kim Hyo-jinHan Mi-young | Han Mi-young |
 Chu Sang-miHan Jin-young | Han Jin-young |
 Sunwoo Yong-nyeoMother | Mother |
 Jeon Jae-hyeongHan Dae-young | Han Dae-young |
 Kim Hae-gonJin-young's Husband | Jin-young's Husband |
 Tak Jae-hoonSang-il | Sang-il |
 Jung Bo-seokProfessor Uhm | Professor Uhm |
 Gong Hyung-jinWaiter | Waiter |
 Shin YiWoman Who is About to Break-up | Woman Who is About to Break-up |
| IIm Hyeon-juMin-ji | Min-ji |
 Lee Jae-hunWaiter | Waiter |
 Jeong Jun-haMan Who is About to Break-up | Man Who is About to Break-up |
 Kim Yae-eunClerk | Clerk |