Tul's first field visit after just moving to work was not smooth. To make matters worse, he had to work with Cherran, the forensic doctor in charge of the case. They had very different personalities and attitudes, which made it difficult for them to get along. Additionally, the social pressures they faced when the cases were in the public eye affected their work. However, as they had more opportunities to work together, their relationship started to improve. The situation became more complicated when a murder occurred that was similar to one a serial killer had committed 18 years ago. Was this the work of the "Raindrop Killer," or a copycat?