Young detectives, who suddenly change to 70-year-old men, struggle to regain their young bodies.

Internet writer Yan Yi Yi entered her own novel and became a vicious female supporter. She fought wits and courage with the emperor to avoid the tragic ending of entering the cold palace but was prompted by the book official that if she did not enter the cold palace according to the plot, she would be obliterated. So Yan Yi Yi survived between maintaining the plot and avoiding a bad ending and secretly falling in love with the emperor.

Eun Dae Gu, Uh Soo Sun, Park Tae Il and Ji Gook - otherwise known as the P4 - are the new recruits in the violent crime unit at Gangnam Police Station. These rookies are neither enthusiastic, nor passionate about their new jobs and have joined the crime squad for varying but unbefitting reasons. They are lead by an erratic and hot headed Seo Pan Suk who wants nothing more than to wash his hands of the incompetent new recruits.

NA

Kurumi Ichiki (Ayame Gouriki) is 25-years-old. When she was young, she went to France. Now, after she came back to Japan, she works as a waitress at high end traditional restaurant (ryotei). She is talented with cooking. Meanwhile, Prime Minister Ichiro Ato (Fumiyo Kohinata) and Executive Secretary of Prime Minister Seiji Koga (Kenichi Takito) decide to hire a cook for the prime minister's residence for the first time in 70 years. Due to an incident, Seiji meets Kurumi Ichiki and discovers that she has a natural talent for cooking. Seiji asks her to be a cook for the Prime Minister. After a hesitation, Kurumi Ichiki says yes. She begins work at the prime minister's residence, but she struggles in a hostile environment with the chef and his subordinates at the restaurant of the prime minister's official residence.

Another search for the truth begins through traces left by the dead. The fourth installment and reboot of Forensic Heroes features a new cast and new stories.

Shen Zhao Er is the daughter of the palace appointed doctor. She grew up with Ji Heng the son of an official of the king. In an incident of the poisoning concerning a royal consort, Zhao Er's father Doctor Shen was framed for murder which resulted in the whole family being executed. The plot of this murder was actually premeditated and carried by a good friend of Zhao Er's father who apparently betrayed him. Due to this plot, Zhao Er's family died in vain, however during the course of execution Zhao Er was saved and she survived. She learns medicine diligently so that she can enter the Ji official family home to investigate the plot behind the execution of her family. When Zhao Er finally made it into the Ji official family manor under the disguise name Tian Qi as the doctor of Ji heng's fiancee, a series of twisted murders and conspiracies unfold before her very eyes which tested both her wit and knowledge in order to save herself and the ones she loved. ~~ Adapted from the web novel Your Majesty, Please Calm Down written by Jiu Xiao Qi.