There is a scene in the story at the 011-xxx orphanage where the loyal children were trained since they were young in 1981.
One person is named Rin but they don't know the real Rin because many children pretending to be Rin even poured boiling water on their faces to cover their faces without revealing the real Rin.
The people who are absolutely loyal to the next experiments.
A normal boy named Rin but was beaten by the dictatorship, he was isolated like the others. At some point, a friend came to befriend them but took his fate card and burned down the orphanage himself causing the fake Rin to go crazy when his friend died in the fire.
15 years later, everything started when the real Rin was able to go back in time to the past