Catch Him to Survive

Chasing is a 2016 South Korean action comedy film about a top CEO who has his cellphone stolen by a fearless gang of male high-school students led by the rebellious Han Won-tae and homicide detective who loses his gun to the same gang of high-school students. Both the gun and the cellphone are very valuable to the CEO and detective. Hence, begins a fast-paced pursuit in order to retrieve their items back from the gang.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.