It's not a mystery that this week's broadcast meets the high percentage ratings for "Nobody Knows." The intense scene with Detective Young-jin mystery case is on.

As per records gathered by Nielsen Korea, SBS's "Nobody Knows" made a huge impact on the audience's Monday and Tuesday night: it reached the highest and peaked at 11.8% on it's the second part.

"Nobody Knows"

Episode 3 - 9.3 percent

Episode 4 - 9.5 percent

Detective Cha Young-jin's quest in hunting down the serial killer of her dear friend is intense. Her passion for beating down the murdered and people behind the crime consumed her. The death of her friend created guilt and perception that she handles everything. She lived alone and never made a life outside of work. She made a big wall in meeting people and she felt unsafe for the loss.

Over the years, the murderer created a path and marked with all the dead bodies. Her best friend's death was also not exempted from this matter. It seems that the marked imprint on the victim's hand. There has something to do with a ceremonial or a sacrifice somewhat like a cult.

In her journey to solve the crime, a young man living below her apartment supports all that she does. Go Eun Ho grew up in the neighborhood by helping her with few errands. Their relationship made a strong mother and son bond.

Episode 3 and 4 are all about Eun Ho's accident and how hurt Detective Young-jin is about it. She goes back to all the tracks that Eun Ho's activity before his fall. The people that surround them are so real that she finds it hard to know if someone is doing a cover-up. There must be something that Eun Ho discovered in the Millenium Hotel where he works part-time. Someone is trying to silence him.

Kim Seo Hyung (in her role as Detective Cha Young Jin) praised by her realistic acting skills. Her wardrobe as an investigator and short hair compliments her fierce eyes. There is more action and mystery that covers all the crime around the city.