The show is an over achiever psychological thriller. The creator(s) cramped up too much into a nine episodes show. It just ends up a little bit lacking of finesse.

The ML is a young student with a simple dream, he just want a normal life. That is until he discovered his split personality, he named his other persona B1. But later on, he learned that he was the alter persona of B1, not the other way around.

B1 was searching for the real culprit in the serial killings that his father was framed for. He wants revenge.

Turned out, his father was framed as a serial killer, his mother couldn't take it and killed her self. Everyone around him have more sinister motives than he thought and his adoptive father is the real culprit all along.

Anyway, it all ended well. It's a good watch.