难以入眠

西北大地上的祁连山脚下，牧马人高青山厮守着一群马，在草原过着天地悠悠的日子。高青山养的马是为了供给采集马血的血站使用的。春天小马降生，夏天草原留下高锦与小马的美好时光。平日里老高喜欢收集各种动物的标本，他经常行走在山间，草原的角落似乎藏着各种不明原因死亡的动物尸体。老高把它们捡回来收拾干净做成标本，有时候还会贩卖给一些游客。未曾想，正是这小小的贩卖使得他一下子陷入人生的被动之地，引来了牢狱之灾。

Gyeong-ah works as a caregiver and lives alone. The only one she can rely on is her daughter, Yeon-su, but it's hard to see her after she moved out on her own. Meanwhile, Yeon-su, who is suffering from her ex-boyfriend, Sang-hyun, argues with him again and visits her mother’s house. After Yeon-su left, Gyeong-ah receives a shocking message from a stranger.