Kim Sun-woo is an enforcer and manager for a hotel owned by a cold, calculative crime boss, Kang who assigns Sun-woo to a simple errand while he is away on a business trip; to shadow his young mistress, Hee-soo, for fear that she may be cheating on him with a younger man with the mandate that he must kill them both if he discovers their affair.
                                    Lee Byung-hun
Sun-woo
                                    Kim Yeong-cheol
Mr. Kang
                                    Shin Min-a
Hee-soo
                                    Kim Roi-ha
Moon-seok
                                    Hwang Jung-min
Mr. Baek
                                    Lee Ki-young
Oh Moo-seong
                                    Oh Dal-su
Myeong-goo
                                    Kim Hae-gon
Tae-woong
                                    Kim Han
Se-yoon
                                    Jin Goo
Min-gi
                                    Oh Kwang-rok
Gangster
                                    Jeon Kuk-hwan
Chairman Baek
                                    Kim Seung-o
Moo-seong's Subordinate
                                    Lee Han-sol
Moo-seong's Subordinate
                                    Kim Soo-nam
Shoulder Bag
                                    Heo Myeong-haeng
Shoulder Bag
                                    Eric Mun
Tae-goo
                                    Park Jin-woo
Cheol-moon
                                    Woo Sang-jeon
Mr. Seong
                                    Jung Yu-mi
Mi-ae
                                    Kwak Min-ho
Lounge Male Employee
                                    Kim Ji-hoon
Pianist
                                    Yoo Sang-seob
Moon-seok's Subordinate
                                    Park Seon-woong
Gyeong-pyo
                                    Oh Yoo-jin
Korean Restaurant Employee
                                    Park Seong-gyoon
Shoulder Bag