Two detectives communicate through a walkie-talkie to solve cold cases. One detective exists in the present day and the other detective exists 15 years in the past.
编剧：
尾崎将也/
上映：
2018-04-10
更新：
2024-11-16
集数：
全10集
豆瓣：信号长期未解决事件搜查组