LOOK: Childhood photos of your favorite Kdrama stars

Joo Won already did a few doctor roles, one was in "Good Doctor" where he played a mentally disabled yet extremely talented doctor, and another in "Yong-pal," where he illegally moonlights as a doctor for hire using the alias "Yong-pal."

Ji Chang Wook starred in the "Healer." The title is also the actors "code name" in the show.

Model Nam Joo Hyuk also starred in "School 2015: Who Are You?" and even played a supporting role in "Cheese in the Trap."

Kim So Hyun recently portrayed twins in "School 2015: Who Are You?"

Ahn Jae Hyun played Jun Ji Hyun's younger brother in "You Who Came From the Star." His leading lady in "Blood," Goo Hye Sun, is now also his fiance.

Actor Lee Jong Suk portrayed several roles such as a reporter in "Pinocchio," a doctor in "Doctor Stranger," and a student who can read minds in "I Hear Your Voice."

Jo Bo Ah played the female lead role in tvN's "Shut Up Flower Boy Band."

Aside from performing on stage, SNSD member Yoona also showed her acting skills in dramas "Love Rain" and "Prime Minister and I."

Kim Yoo Jung played the young Joo Ah-ran in "Temptation of An Angel" and the 10-year-old Princess Cheonmyeong in "Queen Seondeok."

Moon Geun Young starred in "Cinderella's Sister" and "Mary Stayed Out All Night." The talented actress was also known to be the former lover of "Boys Over Flowers" actor Kimbum.

Shin Se Kyung also starred with JYJ's Yoochun, this time in the romantic comedy drama "Sensory Couple."

Lee Yeon Hee was in the TV drama "East of Eden," "Gu Family Book," and "Miss Korea."

Song Joong Ki currently stars in the hit Korean drama series "Descendants of the Sun" as Captain Yoo Shi Jin, a military solider assigned in the special forces team. The heartthrob is also the new Korean tourism ambassador. He was previously known as Maru in the melodrama "The Innocent Man."

Han Ji Min starred alongside JYJ's Yoochun in "Rooftop Prince," and Hyun Bin in "Hyde, Jekyll, Me."

Previously known as Jessie from the romantic series "Full House," the actress is now Song Joong Ki's leading lady in the drama "Descendants of the Sun."

Park Shin Hye portrayed the younger Choi Ji Woo in "Stairway to Heaven." She recently starred in the dramas "Pinocchio" and "The Heirs." She was also in the movie "Miracle Cell No. 7."

Lee Da Hae is most notably known for her role in "My Girl."

Moon Chae Won is also one of Song Joong Ki's leading ladies. The two starred in "The Innocent Man."

Kim Soo Hyun rose to stardom with his hit TV series "Dream High," "The Moon Embracing The Sun," and "You Who Came From The Star." His recent project includes "The Producers."

Yoo In Na's projects include being Ha Ji Won's best friend in "Secret Garden," the antagonist in "You Who Came From The Star" (also known as "My Love From The Star,) and the leading lady in "Queen In Hyun's Man."

Park Min Young starred alongside JYJ's Yoochun, Yoo Ah In, and Song Joong Ki in "Sungkyunkwan Scandal."'

Kim Tae Hee once played the antagonist in "Stairway to Heaven." She then did a few action series such as "Iris" and "Yong-pal."

Hyun Bin starred in the hit series "My Name Is Kim Sam-soon" and "Secret Garden." His comeback drama after his military enlistment was "Hyde, Jekyll, Me."