Paper Dolls - S1.E20

Sude Şen... Model... 25 years old... She died as a result of a sudden heart attack during a catalog shoot for the new creation of the famous fashion designer Pars Tekin. It soon became clear that this attack was not due to natural causes. Sude was poisoned! 
So, who poisoned Sude and why? Did Pars Tekin's assistant Kaan know that Sude was going to be killed? Why had her lover Ozan left Sude? What was the secret that Erdem, a stylist and fashion editor, kept from everyone? Or had Sude paid with her life for her rivalry with her colleagues?