Born an orphan, Ji Hyeok (Kang Ji Hwan) has always had a tough life, scraping by with odd jobs and temporary work. His world changes when one of Korea's wealthiest business families claims he's the eldest son of the president – and the president wants Ji Hyeok to donate his heart to his other son and heir, Dong Seok (Choi Daniel). But it's all a scheme to circumvent the official transplant list. When Ji Hyeok learns the truth, he vows revenge, enlisting the help of Mi Ra (Lee Da Hee), the daughter of the company's driver and Dong Seok's girlfriend. But upon returning from the transplant abroad and discovering Ji Hyeok's involvement with Mi Ra, Dong Seok swears to ruin Ji Hyeok's life.
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