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As early as in ancient times, humans have been fighting with so called monsters, living and hiding under disguise among them. After the human race wins, monsters called "Yaozu" promised no longer use special abilities and completely obey unified management. Thus, mankind and their enemies co-founded an organization, to control both sides. This organization is called the "Mountains and Rivers" or in Chinese "Shan hai Jing of the mountains and rivers".

16-year-old Jang Ji-Gu (Seo Young-Joo) takes care of his ill grandfather, while he hangs out with other troubled kids. He was abandoned by his parents at an early age. After another run in with the law, Jang Ji-Gu is sent to a detention center. One day, Jang Ji-Gu hears that his mother Hyo-Seung (Lee Jung-Hyun) has come for him at the detention center. Hyo-Seung had Jang Ji-Gu at the age of 17 and gave him up soon after birth. Can they repair their relationship?

Young Eun lived with a family ever since she was an orphan and then fell in love with Do Hyun who is 5 years older than her. However, Do Hyun’s family did not approve of Do Hyun dating Young Eun. As a result, Young Eun eventually left Do Hyun and marries a doctor, Joo Kyung Woo. Although Kyung Woo acts like a gentleman, he is actually a mama’s boy with multiple and complicated personalities. Though he treats Young Eun well, he believes everything his mother tells him and will turn on Young Eun at any moment. Jin Ah is a pediatric medical resident and falls for Do Hyun. But she is unsure of his relationship with Young Eun. Do Hyun decides to marry Jin Ah and after the wedding, Young Eun has had enough of Kyung Woo's mother. She decides to leave Kyung Woo. What will happen between Do Hyun and Young Eun? Will they realize they can't leave without the other?

When the world is hit with a naturally occuring virus that spreads among all living things, humans begin to turn into insatiable zombies. In a blink, the world as we know it collapses. Furthermore, the few remaining survivors are unable to use the available food resources. They therefore develop a new crop to support themselves. Survivors depend on one profession, their only hope; someone in this profession must brave the dangers to send and recieve food and packages of necessities. These people are called Riders.