An old walkie-talkie connected two police officers from two eras. The truth of each unsolved case slowly emerged, and at the same time, a larger conspiracy also emerged. Reincarnating again and again in fate, just to save the one you love from death. P. S1. This is a fanfic of Lee Jae Han and Park Hae Young. It follows the direction of the original work. Because the plot of Signal itself is very exciting, it basically follows the original work. Only the emotional line between the two is added and other related emotional lines are weakened. 2. Even if you have never watched this drama or have watched it for too long and forgot the plot, it will not affect your reading. 3. Regardless of offense or offense, I just write about these two people. 4. We will update it after writing the article.