Watch Do You See Seoul? (2008) Drama Movie With English Subtitles

In 1976 on a remote island, school teacher Eun-young wants to take her students on a field trip to a cookie factory in Seoul. Even though the parents don't like the idea, Eun-young succeeds in convicing them. But once they arrive in the complicated city, some students become fascinated with high-tech bicycles and get lost.

Source: OkDrama