The dynamic between the three leads—Sung-joon, his judge brother Sung-hoon, and social worker Jo Eun-gi—becomes increasingly strained.

: Despite finding evidence that seems to incriminate his brother, such as a missing earring in Sung-joon's car, he begins to suspect that Jung Man-chun might be innocent of the copycat murders.

: She continues to struggle with survival guilt after a hostage incident, even as she becomes more entwined in the brothers' investigation. Symbolic Resilience

This episode is pivotal as it transitions the series into a "clear your name" thriller, humanizing its leads while maintaining a gritty, suspenseful atmosphere. Blind – K-Drama Episode 4 Recap & Review

The episode concludes with a harrowing escape as Sung-joon, battered and bloodied, flees through the woods to avoid his captors. His desperate leap down a chasm symbolizes the "hell and back" journey his character undergoes, moving from a suspected killer to a victim of a much larger, darker conspiracy.