The story of a detective who accidentally travels from the past to the present. He goes from walking along the ridges of rice paddies for clues in 1986, straight into 2016. Wherever he goes, he causes trouble and creates problems, but his antics are funny and bizarre because he is an old-fashioned detective from the past trying to adjust to life in modern day.
Shi-Hyun grew up in an orphanage, before running away from there. He then made a living by working as a drug courier and picked up the nickname "Doctor's Son." He's now the boss of a mid-size gang. His drug supplier is a man known as Scale. Shi-Hyun has plans take over his position.Meanwhile, Hyeong-Min becomes the section chief of a special investigation unit. Their goal is to take down Scale, who killed an undercover officer. While trying to catch Scale, Hyeong-Min learns about Doctor's Son. Now, Hyeong-Min and his team go after Shi-Hyun.
Ma Yi-Deum has worked as a prosecutor for 7 years. She sometimes resorts to drastic methods to win cases. One day, Ma Yi-Deum is transferred to a special division dealing only with sex crimes.