Recommendations

Both have some supernatural twists that deals with "dreams" (or technically, parallel timelines for W2L). Both encountered mysteries that they can solve because they have witnessed/experienced it.

—too many misunderstandings
—FL of TBWY is a SL in RTTDS
—not a very clear ending, more like open

loveyou.
Everything is very touching
I wish you lasting progress and success I wish you all happiness

Both dramas have Two friends who fought gangsters and police corruption
they tried to protect and save each other from the cases they are involved in
The korean drama has more fight scenes and side romantic story
not sure about the chinese one yet

Both Bromance dramas
Both new amazing friendship dramas
they both have two male leads who are friends and helping each other , protecting each other
have different background and painful life

Rental deals with alive people and their problems, experiences, and emotions.
Meanwhile, Dele explores people which already passed away.
Both series are episodic and have well-developed characters.

Both dramas involve retaired professional athletes and promote physical activities for non-professionals.
If you wish for nice motivational dramas to start doing sports these two are a must.

Both shows have the same main cast and were made by the same screenwriter-director duo (Fatball and 25) making them look almost like spin-offs or remakes

While the plot for both shows isn't that similar, they use the same way of storytelling where each major event is shown from different POVs that complement each other

Similar vibe and plot - a group of lonely people bonds together after they get involved with each other because of money-related crime

Psychological thriller
Possibility of Main lead being the killer
Doesn't hold back in terms of gore
Dark theme/colors
Main lead is a cop/detective
Killer has a particular M.O.

Both have The same Bromance between the male leads
it's stronger and more apparent in Killer and Healer
also Both have detective cases they both partner up to solve
Both are in Republican era and have the same gangster's stories
the same Police corruption
the same dangerous fight scenes with the mob
the stories are different in details and in tone
My roommate is a detective is a lot lighter and brighter than Killer and Healer which is a lot darker and heavier but both are the same in so many aspects

They are similar in so many ways
The friendship between the two male lead is exactly the same
the detective and the doctor are similar to the detective and black robe in Guardian protective to each other and they both have their own problems that endanger their lives and their loved ones
I know it's too early to recommend similar dramas but from the first 8 episodes I've seen they are a lot similar in dynamic and Bromance not the actual story it's totally different

Class of Lies is also about getting justice. Although the genre is a bit different, I found similarities.
-In My Strange Hero, a 27 year old man goes back to high school to finish his education and they fight for justice in the school system. This show is more of a melodrama and school genre.
- In Class of Lies, a lawyer is fired for defending his client, who is suspected of being a murderer. So the lawyer goes to the school in which the crime suspect was, and pretends to be a teacher, so that he can bring justice and find out who the real murderer is. This show is a murder, suspense, school thriller show.
Both shows have the common theme of bringing justice.

Both of the ML's are thrust into detective work — He Is Psychometric's ML having been working hard to do detective work, while ZD's ML was forced into it to solve his own murder.
Both of the ML work hard, and they also stumble across their FL by accident.

The detective plot was what stuck out to me in the two, and while there are similarities here and there, they are also uniquely themselves. Definitely a good watch if you liked He Is Psychometric and want another drama with a similar vibe.