After the mysterious death of Phisai, Jetiya begins to investigate due to pleading from Phisai. Everyone suspects Prim’s father, but there is no solid evidence. The lack of evidence allows Prim’s father to walk freely. While investigating Jetiya finds out that Prim’s father went to visit his friend Wanan Graiwin, and Wanan is suffering from a muscle disease. Jetiya also finds in her investigation that Wanan is Laphin’s father Sarat’s best friend and former partner.