Recomendações

They both have incredible psychopath killers, and the past and present stories were also linked to each other, that hunts the main characters.
-But though they have that kind of similarities, I think Gap Dong was darker than, 'I Remember You.'

its just fantastic !!!! just watch it ! you wont be disappointed

Both dramas have both the main male leads as brothers but both characters don't know that they are brothers. Both the father and mentor of the main character for both dramas was played by the same actors. Finally, both dramas are about avenging the death of a father, but also becoming the true king that the people of Joseon deserve.

Scholar Who Walks the Night is one of my favorite dramas. It has many supernatural twists. Mirror of the Witch is about witchcraft and SWWTN is about vampires. Both ways, both are Sageuks in the "dark". If you love this drama, give Scholar Who Walks the Night a try!

both involve a main female lead who sets out for revenge against the people who have wronged her. Both have intelligent and awesome main female leads who know exactly how to step on the throats of the ones who wronged them. They also both involve a rich family that have something to do with the main female lead and is about how the main girl fights back to reclaim what is rightfully hers.

Both involve a character that travels through time and becomes involved in the royal family

Both are about correcting mistakes of the past, they show how life choices can change your life but it's not too late for a second chance.

both female lead help an investigator to solve a crime that involves supernatural abilities.

Both of them are really exciting, every episode is different, but there is main plot somewhere hidden. And even main characters have quite good stories to share :D

Both connects with a Student-Teacher relationship. These movies made me speechless to the point I dont know where am I anymore. It also have similar events that was so dark yet emotional at the same time and it was just executed brilliantly.

similar concept with multiple heart breaking scenes, and both fujitv getsu9 drama..............

Both a extremely well written and directed tvN shows that both aired in 2016. Both focus on cases that seem irrelevant at first but tie up really well by the end. Though I would personally favor Signal for its unique time travel aspect and how it moves on from case to case almost effortlessly, Pied Piper does not disappoint in the least. The thrill both shows give, specially in the latter half is wonderful. If you liked one, you'll love the other.

*) Hwang Jung Min's movie
*) Law & criminal
*) A roller coaster between the bad & the good guy
*) Comedy & action

*) Detective thingy
*) Based on friendship case
*) Same amount of comedy and action

Both female lead works in a funeral services and connected to a dead people.
in RB dead people ask her to help them and solve their death.
but in MP she travels back to time to save the dead people.