In the year 2961, the time is after humanity and nature has recovered the land. A hunter named Cygnus is called to rise above his duty. He provides for Last Arc, a once nomadic band of survivors in need of food and water that is now growing scarce. The answer must be found before a group of outlandish Heretics descend upon them. Cygnus must voyage across the treacherous landscape to defend his people. Sent by Nova, the matriarch of the band, she acts based on her vision for Cygnus to find a seed of hope. The future of Last Arc is for him to discover, Cygnus ventures into a hostile landscape in search of an answer for his people. On this journey of encountering many traps and dangers, Cygnus discovers what has been hunting him is his identity.

一天清晨，刑警驚覺自己的搭檔失去了音訊。事實上，搭檔在夜晚返家的途中，意外目睹一起犯罪行為。不料現場突然發生提款機爆炸，她身受重傷，隨即被犯人綁走。

 外表平平的金哲秀（薛景求 飾）是大韓民國的一名身懷絕技、勇武干練的特工，但在日常生活中他偽裝身份，連妻子英熙（文素麗 飾）也對其真身一無所知。在老婆面前，他是唯唯諾諾，毫無氣場的普通上班族。哲秀就在危險和平凡中小心翼翼保持平衡。某天，即將參加六方會談的朝鮮代表白武鎮乘坐的飛機被恐怖分子擊落。由于該次會議事關重大，影響著南北統一和放棄核武的協議簽訂，因此韓方派出金哲秀和搭檔們去泰國營救白武鎮擁有豐富核武制造經驗的女兒白雪希。與此同時，身為空姐的英熙在和丈夫吵完架后飛赴海外，途中邂逅了英俊帥氣的男子萊恩，殊不知此人正是暗殺白武鎮的冷血殺手。危機重重的泰國，金秀哲經歷著來自國家和家庭的嚴峻考驗……

　　我叫夏津生，做水產生意，45歲那年我兒子跳樓自殺了，他死后第37天我進了他所有的群，我發現里面全都是有抑郁傾向企圖輕生的孩子，我不知道為什么，我在“約死群”留言1萬9千次，問過127個男孩，49個女孩，到現在也沒有答案……