A Cruel Attendance (2006)

Dong-Cheol (Kim Su-Ro) is an ordinary salaryman. He's also a sweet husband and caring father. Dong-Cheol though finds himself in trouble. He lost a lot money in the stock market and is now in heavy debt. He also has to pay back a cut throat loan shark very soon. Dong-Cheol then meets Man-Ho (Lee Sun-Kyun), who is also in debt. The two men then concoct a plan to kidnap a child for ransom. Unfortunately, their plans go awry with the kid's parents not even answering their calls. They then go after a bigger score. The two men plan to kidnap high school student Tae-Hee (Ko Eun-Ah), whose parents are extremely rich. Things don't go according to plan as Tae-Hee is a troubled teen. Making matters worse, Dong-Cheol answers a phone call and hears, "I kidnapped your daughter. I kidnapped the kidnapper's daughter."