[4][5] Shooting champion Ok Chan-mi does not believe that her twin brother committed suicide.

Just as the police begin to wrap up the case, Chan-mi transfers to her brother's school to find his killer.

She meets and gets involved with Ji Soo-heon, a boy with many adversities in his life who also seeks justice, but in a rather dangerous way.

Together, they work towards a common goal; getting revenge on perpetrators, despite knowing the risk.

[6] On September 7, 2022, the cast was announced to include Shin Ye-eun and Lomon who had already been confirmed as the lead roles.