Similarities:
- friends to lovers
- seperation due to misunderstandings

...you will see if you watch the other

Sinilarities:
- Both are historical dramas with comical elements.
- FL in both dramas is surrounded by multiple MLs with whom she forms a friendship.
- MLs have a hidden past / agenda.
- There is a love triangle in both but in H it's more present than in TSRG

TDIM is similiar to WYD in terms of:
- soul switch [older man in a younger man's body]
- unknown child [in TDIM it's his daughter]
- classroom setting of some sort [father and child attend same school and class]
- it's a comedy
- older man has an "difficult" job (for a highschooler) [in TDIM he is kind of a mafia boss]

TDJ has a judical system by which citizens are legally obliged to vote in favour or against the defendant, determining the defendant's future.

So here are a few similarities:
- the ML /FL underwent a gender changing surgery (in DSILY female to male and in TFL male to female)
- the couple knew each other since childhood (in TFL the ML is the not-blood.related uncle of the FL)
- both main leads return (among other things) because of their love

Actually over all the gender change is the only similar trope, as you might have notice TFL is not a BL. But TFL is so good as well. It definitely does not have the same vibes as DSILY, it‘s a bit darker and (of course) dramatic and emotional (not in a feel-good way). But anyways you should check it out!

Both series are BLs.
MLs can see one specific ghost/grim reaper.
In both dramas the MLs know each other when their were children (in DDICFS they actually meet as humans, in HCTM they meet as human and ghost already)

Despite the fact that DV is about a hetero love story and Triage is not, these two are somewhat similar in plot.
In DV the FL also tries to bring ML with whom she is in a relationship back to life by going back in time.
But ML doesn’t remember her let alone his romantic affections for her.
In DV there is also - different to Triage - a SFL who tries everything to get between those two.