Jung Ba Reum's (Lee Seung Gi) hidden identity was finally revealed in episode 15.
Something triggers his brain and brings back all the memories he had years ago.
Jung Ba Reum's Past Memories Haunt Him
All the kindness he showed before were fake to hide his true colors. In the flashbacks, it was revealed that he's been a predator from the start - even before he met Go Mu Chi (Lee Hee Joon).
Jung Ba Reum was the one who stabbed his friend Na Chi Kook (Lee Seo Jun), and he cried out of guilt.
One of his childhood friends Koo Dong Koo (Woo Ji Hyun) informed him that Na Chi Kook woke up after years of being in a comatose state. This gave Jung Ba Reum a bigger problem, knowing that only the two of them know what really happened years ago.
Jung Ba Reum arrived at the hospital. He was surprised when Na Chi Kook hugged him for the reason that he missed him. This triggered Jung Ba Reum and wanted to surrender to the police.
He was also the mastermind behind the death of Oh Bong Yi's grandmother, the brutal death of Go Mu Chi's brother Go Mu Won (Kim Young Jae), and all the murders that happened in their city.
Jung Ba Reum was being haunted by his past and the only solution he had in mind is to kill himself. When he was about to take his life, Daniel Lee (Jo Jae Yun) stopped him.
Jung Ba Reum confessed to Daniel all the innocent people he killed.
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Sung Yo Han is 99% Innocent and Jung Ba Reum is 99% Psychopath
Daniel Lee said that he should not die irresponsibly. If he really cares for the dead victims, he will face all the consequences give them the justice they deserve.
According to Daniel, Jung Ba Reum should kill all the predators to prevent the psychopaths being born.
It was also proven that Sung Yo Han (Kwon Hwa Woon) is one percent psychopath, according to Daniel Lee's DNA results year ago. He underestimated the result since Sung Yo Han is Han Seo Joon's (Ahn Jae Wook) son.
During the brain transplant, it was not the bad memories that were passed to Jung Ba Reum's brain but rather various emotions that will give him the opportunity to be a normal human again.
The next day, Jung Ba Reum visited Nam Chi Kook in the hospital. His friend remembers all that happened to him and he asked Jung Ba Reum to turn himself to the police so that everyone could live peacefully.
After hearing those words from his friend, Jung Ba Reum immediately went outside the room, that's when Go Mu Chi went to check Nam Chi Kook. He was shocked, however, to see him having a hard time breathing. The doctors rushed to the room, but Nam Chi Kook died.
Go Mu Chi looked for Jung Ba Reum inside the building, knowing that he was the only person who visited Nam Chi Kook. When he saw him, his tone was serious and full of authority, having the hunches that Jung Ba Reum is the real psychopath.
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Written by Shai Collins