Big Man - Season 1 (2014)

Orphaned at birth, Ji Hyeok has struggled to survive for as long as he can remember. He has done everything from being a boxer to working as a street thug. His whole life turns upside down when he suddenly finds himself the son of one of the largest conglomerate families in Korea. In an attempt to save his biological son, Dong Seok, Chairman Kang Sung Wook tries to take Ji Hyeok's heart and give it to Dong Seok. However, in the middle of the transplant surgery, Ji Hyeok miraculously wakes up from anesthesia. When the media catches wind of his existence, Chairman Kang panics and tries to play off Ji Hyeok as his real son. Meanwhile, Dong Seok is forced to go overseas for a heart transplant. When he returns, he immediately seeks out his girlfriend, Mi Ra. However, when he realizes that Mi Ra has developed feelings for Ji Hyeok, he sees red and vows revenge, paving the way for a complicated future for these two men connected by a strange twist of fate.