Trace: Kasouken no Otoko

• Both revolve around crime investigations where the protagonists dig through clues to uncover the truth.

• Each story focuses on hidden pasts and long-buried secrets that resurface through the cases.

• They mix procedural investigation with human emotion, exploring the psychological impact of crime on both victims and investigators.

• Both have a dark, serious mystery tone, centering on unraveling complex cases rather than light or episodic storytelling.

Both dramas follow a forensic specialist with a tragic past. Each episodes focus on the case while we get few clues on main characters backstory.
Overall it has a similar tone. The cast/acting is also good. Definitely recommended to the fans of crime/investigation genre.

While the two series weren't quite similar aside from the common crime/investigation genre, there was at least one common trait. As in, the fact that both dramas featured Nishikido Ryo as an eccentric forensic officer/expert. And for people who're a fan of the actor, it'll be interesting to see how Ryo's character differed in Joker as compared to Trace.

it gave me a similar vibe of the 2. Although Yakusoku were quite fully focused on 1 case and Trace has a few other cases but the main story and vibe is similar.

similar in the sense that it is a crime/detective/thriller show. people are solving cases and it's pretty episodic. also, they are both pretty good and enjoyabled. 8+

detective mystery show, where the mc's are solving cases together, but one of the mcs have their own "case" they have to solve for themselves

The male leads in both are quite similar, except for their jobs. Both have experienced a trauma in their pasts which have brought them to where they are now.

Both have the possibility of romance which isn't explored but hinted at.

Forensics is a shared focus in both dramas. While "Trace" solely focuses on crime solving episode - to - episode, "I Know Your Secret" has a little bit of drama and added intrigue.