In 1938, a girl, Joo-Ran (Park Bo-Young), is transferred to a boarding school in Keijyo (old name of Seoul). Joo-Ran learns of another student with the same name and she tries to figure out the hidden secret of the boarding school.
Lofty (Gu Shang Wei ornaments) grew up being trafficked, and was
trained as a black boxer, salsa (Choi Yun Su ornaments) parents when
they were sold to a small underground brothel. Childhood lofty, in a
chaos rescued salsa, and lofty in turn was the eldest child (Bryan
Leung ornaments) recaptured.
100 years ago, titans suddenly appeared on Earth. Soon, human civilization veered on collapse due to the titans. Humans then built a giant wall to defend themselves. Within the giant walls, humans lived in peace, but, 100 years later, the giant wall is broken.