Kim Da-eun and the robot 0521 coexist together, and are responsible for stabilizing the seal of the world boss Hela, but they lost their memory and fell asleep in an accident. Hela is quietly waking up, and Jin Daoen is also on the road to searching for her memory and life experience. There are too many secrets hidden in her body. How to unlock them?
Concept: Symbiosis and bonding, memory and identity