Səkkiz (シーズン 1)

After the suicide of his schoolgirl daughter, the protagonist's life falls apart. This loss awakens hidden childhood traumas in him, and the pain turns into a desire for revenge. He begins to target the people he believes are responsible for his daughter's death, one by one. His ex-wife, an indifferent nurse, the school principal, and those closest to him stand in his way. Each murder should have freed him, but on the contrary, it drags him deeper into darkness. This man, who appears calm and kind in society, is a completely different person inside.