Which stars were active when they were young?

Let's all get in a time machine and go back a few years... to a time when all these idols were all struggling to find fame. KBS YeoYouManMan showed the "Best 3 Child Actors" in a recent episode, which has caught the attention of many. The first featured celebrity was Yoo Seung Ho. He was the little boy in the major hit film, The Way Home and made all of Korea cry with acting that was stellar for his age. Now, he's grown up to become "Nation's Little Brother" and earned the nickname of "Little So Ji Seob." Moon Geun Young was also chosen because she played the younger version of Song Hye Kyo in Autumn In My Heart. Moon Geun Young did many of projects at a young age and has earned a good reputation for being one of the prominent actresses of Korea. Jang Seun Suk was also a child actor. He starred in drama Hwang Jin-I and has since matured and become more appealing to many fangirls. Other idol stars, such as G-Dragon, Park Gyuri and Lee Hongki were all active when they were young. G-Dragon was part of "Little Roola" whereas Gyuri acted as a younger version of Kim Jung Eun in a drama. For Lee Hongki, he acted in a children's show, Soori Soori Masoori Weren't they all so cute?