Haha

Beautiful, sexy Ji-young is placed at an all boys' high school as student-teacher. Teenage boys in puberty think of her as a sex goddess and fantasize about her. Then from one of the classrooms, Dean of Students sees a silhouette of a couple embracing and hears a woman moaning. He goes to the classroom only to discover a pair of red stilettos. He suspects Ji-young and is resolved to protect the boys from her sexual charms. (divxplanet)

This time round Doo Sik is a senior at college, where he is studying to become a teacher. During the day he works hard teaching morality and ethics, but at night continues to work as a gangster. He gets a placement at the local high school, working as a student teacher, but then trouble arises amost immediately. Always determined to keep him studying hard, Doo Sik's boss has also returned to high school to complete his own education. Now Doo Sik has to face his boss at school as well as at night (kmovieaddicts.blogspot.com)

Accidentally dying one day before his release from prison, a conniving father returns from the afterlife in the form of a high school student in order to reconnect with his son.

A variety show in which cast members will go to a South Korean landmark and play games there. There are several games to be played within the landmark and at least one of them has to do with the specific landmark and with running, hence the title Running Man. (imdb)