They are both Bromance dramas
Both are detective historical dramas
Both have weird cases or mystery cases to solve
Both are costume fantasy drams

Both bromance dramas
Both friendship dramas
Both youth dramas
Both have best friends and youth tropes

Both bromance dramas
Both friendship dramas
Both youth dramas
Both have best friends and youth tropes

Both bromance dramas
Both friendship dramas
Both youth dramas
Both have best friends and youth tropes

Both bromance dramas
Both friendship dramas
Both youth dramas
Both have best friends and youth tropes

Father and son same age in high school on both dramas
There is a friendship element in both dramas
Both fantasy dramas
Both youth dramas

Father and son same age in high school on both dramas
There is a friendship element in both dramas
Both fantasy dramas
Both youth dramas

Father and son same age in high school on both dramas
There is friendship element in both dramas
Both fantasy dramas
Both youth dramas

Same plot
same costume drama
different nationality for both but the same theme
cross-dressing comedy

It's alot similar to this drama
it's in retro too from 1997 and it has full team detective like family
they catch corrupt and gang members too
so it's the most similar to this drama and bonus in the first shot drama there is bromance added to the mix

Both are detective dramas
Both have friendship between two male leads
Both have one of the male leads with a traumatic past
Both have grave crimes

Both friendship dramas
Both detective dramas
Both have the male lead with a traumatic past
Both have grave crimes