SEE ALSO: 'Big Man' releases additional action-packed teasers of its 'David and Goliath' story

Lee Tae Woo will play the younger Kim Ji Hyuk (Kang Ji Hwan) who becomes the eldest chaebol son overnight and Nam Da Reum will play the younger Kang Dong Suk (Choi Daniel) who grew up rich but has a weak heart.

Lee Tae Woo previously starred in 'The Wang Family', 'When A Man Loves', 'A Hundred Year's Inheritance', and 'Wind Blows in Winter', while Nam Da Rem starred in 'Three Days', 'Suspicious Housekeeper', and 'No Breathing'.

'Big Man' portrays the story of an orphan who goes through a fight reminiscent of 'David and Goliath' as he tries to protect himself and his loved ones. It�premieres on April 28 at 10 PM KST.