What actors and actresses appeared in Summer Story - 2004?

You're likely thinking of the 2004 South Korean film "A Moment to Remember", sometimes called "Summer Story" in English.

Here are the main actors:

* Jung Woo-sung as Choi Chul-su

* Son Ye-jin as Su-jin

The film also features:

* Kim Ji-hoon as Joon-ho

* Bae Jong-ok as Chul-su's mother

* Kim Yoon-jin as Su-jin's friend

* Kim Myung-gon as Su-jin's father

If you are looking for a different movie with a similar title, please provide more details.