Revolves around an emergency call center and the employees who attempt to fight crime using the limited information they get from the urgent calls they receive.
A cold-case profiler in 2015 and a detective in 1989 work together to solve a series of related murders spanning three decades using a special walkie-talkie to communicate with each other.
Jin-Woo is a young man with the condition of Hyperthymesia, which allows him to remember everything in details. In order to prove that his father is innocence, he becomes a lawyer and make a team to solve different cases using his memory.
A prosecutor has lost his memory and discovers that he is convicted on death row. He is now left with no option but to find the truth behind his condition and prove his innocence.