A new teaser for “Nobody Knows” has arrived.

In the clip, Kim Seo Hyung begins, “After I became a cop, I constantly felt as if I was looking at someone else’s life through a microscope.” She washes the blood off of her hands and a pair of handcuffs before staring at her reflection in the mirror.

Looking at photographs taped to the wall, a student says, “There’s something I want to say. You won’t know unless I tell you.” He looks troubled as he bursts into tears before falling from the top of a building.

Kim Seo Hyung quickly heads somewhere and looks frantic as she calls someone on the phone. A man says, “Until last night, we said that the Sung Heun case would be the last one.” Kim Seo Hyung tearfully adds, “Now and during Soo Jung’s case, this is the only way I can get rid of the awful feeling of guilt.” There’s a look at a file that has the words, “I can’t say it. But… please help me anyway.”

As Ryu Deok Hwan peers at the ground from the top of the building, he asks, “You think that the things that happened to Eun Ho may not be a coincidence, don’t you?”

Park Hoon poses a hypothetical question to Kim Seo Hyung and asks her to choose a side. The clip concludes with the words, “Even if you can’t speak, I’ll help you.” Kim Seo Hyung states, “I’m going to find out the story that even you don’t know, Eun Ho.”

“Nobody Knows” premieres on March 2 at 9:40 p.m. KST, and will be available on Viki! Check out the clip below: