Who or What Am I?

Dong-ju's primary concern upon the boy regaining consciousness is whether his old memories have returned. Dong-ju is fully aware of his grave mistake and feels obligated to reveal the truth, regardless of whether he remembers anything or not. Simultaneously, as the murder cases and missing persons investigations progress, the similarities between them intensify, leading to a growing momentum. However, Dong-ju has no idea how this would affect him.