When Yeon-woo's sister dies under mysterious circumstances, he's left with only a cryptic message and a burning desire for answers. As he searches for the truth, he's aided by Min-ho, a man with a troubled past and a connection to Yeon-woo's sister that he's hesitant to reveal. As they dig deeper, they uncover a dark web of secrets and lies that lead them down a dangerous path. Will they find the truth behind Yeon-woo's sister's death, or will the truth tear them apart?"