Recommendations

Both movies has love triangle
Both main female leads are detective.
Lots of action
Crime investigation, no dull moment

Both movie has a beautiful female detective.
Romance in both movies
Lots of action. Very intense
Strong female lead.

Both movie has a beautiful female lead that is a detective.
Intense, action movies.
One has love triangle, the other one does not
Full of action pack

Female detective on both
Intense, action, crime
Involve romance on both
Strong female lead, strong male lead as well

Nobleman Ryu's wedding is also a historical Korean BL
Nobleman Ryu's wedding also contains a ML that is a kpop idol

-Death Bell is more to the horror side but both are about death game that the studens should pass to survive.
-both are gore-thriller

IN PLOT LOVE in order to investigate the truth about the suicide by the only relative,FL had to restrain herself and pretend to be a virtuous wife, approaching her "ex-husband" ML who had not been in contact for seven years. while in LIE TO LOVE she pretends to be amnesiac for same cause.
In both shows they clear the misunderstanding later.

-both are about healing time for the members where they sleep outdoors, cook, and have fun.
-both take place outdoors in nature with the hardships of camping stuff.

The unhappy adult main lead (s) travel back to youth period, where she and they were happy, careless, energetic and having fun. It is an easy watch romantic comedy

-both are about relationships of multiple coples, but 7 Something separated them in different segments.
-both have their characters learning something new from their couples.
-both are light-hearted romance

Both female leads were adult in the thirtieth but mentally as a teenager.
Somewhat comedy, fun and easy watch.
Quite romantic.
Cute couples

-Both stories focus on relationships of multiple couples.
-Both have light and fluffy romance with hints of comedy.

The character travel back and forth from young to old and old to young.
Somewhat comedy
Fun watch. Not too serious. Good acting.

Both female leads has terminal illness
The male lead knowing that and stick with her till the end.
Very romantic, love story

Both female leads has terminal illness
Very very romantic movie
Heart warming,
Male lead remain on her side till the end