Fallen Angels (Duo luo tian shi)

Synopsis

The ever-so-smooth Killer, a gun-for-hire, resigns from his job when he starts feeling the growing pressure from his beautiful boss, Agent, about his whereabouts. The real problem at-hand, however, is that both parties are falling in love with each other; and neither the cunning Killer, nor the ruthless Agent can deal with the reality of their situation.