These scenes can be found in the beginning of Fly Daddy Fly movie, which was remake of Japanese’s Fly Daddy Fly (2005)
Kim So Eun (yes, the girl who played Gaeul in Boys Before Flower) played a role in the movie Fly Daddy Fly (2006) which also featured Lee Jun Ki.
The story is about a father (Lee Moon Sik) who wanted revenge to the people harrassing his daughter (Kim So Eun). But, he knows that he can’t do much. He later learned fighting from Ko Sung Suk (Lee Joon Ki played in Iljimae) who is famous for his fighting talent.