Big Man (2014)

Big Man is a South Korean television series that premiered in 2014. It stars Kang Ji-hwan, Choi Daniel, Lee Da-hee, and Jung So-min. It aired on KBS2 for 16 episodes from April 28 to June 17, 2014. Jung So-min plays Kang Jin-ah, Dong-seok's younger sister. A badly behaved, self-centered heiress, Jin-ah is used to getting her own way until she falls in unrequited love with Ji-hyuk.

Kim Ji-hyuk was an orphan who was raised in poverty and had a "third-rate existence" until making the decision to change his ways and work tirelessly toward his modest goal of opening a restaurant. He gets entangled in a plan to save the life of Kang Dong-seok, a chaebol heir who needs a heart transplant, and is told that he is Dong-seok's older brother and begins a lavish new life in that world... and then later learns that it was all a lie. Ji-hyuk sets out on an impulsive quest for vengeance in order to defend himself and those he loves after becoming disgusted with the corruption of his chaebol "family" and motivated by hate of the unjust facts of the world.

Detailed information:

Starring: Kang Ji-hwan, Choi Daniel, Lee Da-hee, Jung So-min

Original release: April 28 – June 17, 2014

Link to watch: imdb.com/title/tt3715044/