- The male leads have a dark past and the main plot revolves around them.
- The female leads are both their juniors who joins the team.
- Both series focuses on homicide cases

-The male lead in both dramas are cold and experienced in their line of work.
- The female lead is a newbie or in case of Dr. Frost a student.
- They are not investigators but they help the police.
- Dr. Frost focuses on the psychological aspect while Dr. Qin leans towards the forensics
- The main plot of the story focuses on the life of the main leads and they both have dark pasts.
- Both dramas have interesting crimes :)

Both the dramas have some relation in the supernatural happenings. Where as in Signal regarding the messages with the past and in Cheo Yong in relation to the ghosts. Both focus on solving crimes in the society.

Both the series consist of a character who can interact with ghosts. And the ability is used to solve crimes in the society with the help from the ghosts.

Both the dramas revolve around a genius who has a troubled past.

The main character in both the dramas have lost someone dear to them in a past case. Also both the dramas consist of a group of people that come across each other accidentally due to a case leading them to form a team together.