Romantic Warriors(2003)

Original title: 낭만자객

A group of deadly assassins kidnap a hostage in the hope of getting a high ransom but when they manage to lose themselves in a forest and end up spending the night in a haunted house they manage to disrupt the plans of the ghosts to ascend to heaven. The assassins hatch a plan to solve the problem but in doing so reveal themselves to be incompetent, so the ghosts decide to give them some training themselves…