"Xinyi" Lee MinHo (actually debuted very early, only because he took a fancy to men in 2008)
"The Moon Embraces the Sun" Jin Xiuxuan (I have only played dream heights before, so I am a newcomer)
Park Yoon-chun (although he debuted as a singer for many years, he is still a newcomer in acting, and he has played two TV series before).
There shouldn't be anyone else who can be counted as a newcomer. I wonder if I can help you.