+ Both dramas are extremely well connected crime dramas where the cases are linked to the characters on a personal level.
+ both thematize the psychological aspect => While in Signal the psychological aspect is more debated and analyses, in Burning Ice you can really see psychological methods being used.
+ Both dramas show very well character development.
+ both are connected to past events

If you enjoy the cases in Signal you are bound to enjoy Burning Ice.

Both dramas deal about girls that are getting bullied and have something happen to them because of this. In both dramas family members take revenge and things become very fast very extreme.

Perfect World is the romanticized version of Josee, and Josee the brutal reality of Perfect World.
While Josee deals about a girl who is handicapped, Perfect World deals about a guy who is in a similar situation. Both dramas deal about the perceptions of being disabled and also about what this means for the family, their love life and the people themselves.

Poor husband, wife's dreams broken => leads to divorce. Then after years of separation both meet again. Both males are now successful while their ex-wives are not having much work out for them. And the drama begins.

Both dramas revolve around friends and their lives with each other and with their marriages. Especially one couple is very similar to the main couple of The World of the Married. Both females are doctors, both couples have sons, and both couples deal with conflicted feelings, with obsession and deceive, secrets and murder. But also the other couples have their respective drama and betrayals.
If you liked especially the female lead in The World of the Married, you will love Graceful Friends, for she is nearly the exact same person.

Flower of the Evil and Blood and Ties are both very dark and brutal dramas. Both deal about families where one member has a secret past tied to a crime and another member finding out about it. In both dramas this crime revolves around a murder.
In Blood and Ties it is however the daughter that is suspicious of her kind father, whereas in Flower of the Evil it is the wife that doubts her husband more and more.
Both dramas feel very similar.

Both dramas follow a similar concept: In Train we have someone who switches places with himself of another world, while in "Your Honor" a twin switches places. In both dramas there are cases that need to be solved. If you like the concept of the one drama, you will probably enjoy the other..

Although one is about time travel and another one is not, both dramas have lots of similarities with their respective cases. In both dramas we have a police team that has to deal with similar cases, and situations. Both main leads get help from a female lead who is not involved in the police department. Both cases are gripping and surprising and full of twists and turns one would not expect.

A mysterious detective partner duo, teaming up with a strong female lead. Corruption, cases being not what they seem to be, and police officers making mistakes. All are both themes in both dramas. So far, however, The Good Detective seems like the little sister to Watcher. If you enjoy The Good Detective you will adore Watcher.

Both dramas are about a married couple who is not married for love and both couples face difficult decisions and situations. Both dramas also have something to do with unfaithfulness and in both dramas we have very strong women who are willing to cross lines for their work. Both dramas are very, very, very mature and are so powerful that one has to stop often in order to keep on breathing.
Both dramas have also gotten an ending that robs one of all the last piece that was left while watching them.
They are masterpieces of no comparison.

Both dramas have mature themes and strong female and male leads.
Both deal around a similarish couple. In both dramas the circumstances are similar and the characters themselves are similar as well. While in "The World of the married" this specific thing happens to the main couple, in "Money Flower" it is a little more complicated. Interestingly in both dramas Han So Hee plays in both dramas the mistress.

Both leads are very similar when it comes to their character and both dramas are in general having a lot of similarities as well. Both deal about leads that suffered a devastating loss in their childhood, and both got shaped because of that. Both became police officers due to that and both are faced with a crime that hits very close to home.