eung-Joo is a CEO and Jung-Taek is a detective. They have known each other for 20 years.
One night, Seung-Joo loses his cellphone to four male high-school students and Jung-Taek loses his gun to the same high-school students. The cellphone and gun are very valuable to Seung-Joo and Jung-Taek. The two men must get their items back from the high school students.

Overview from themoviedb.org