both are time travel dramas
the only common thing about the two dramas is time travel
nothing more

The two dramas are about time travel
the two dramas involve the complicated family relationship
and love story

The two dramas have the retro theme of Korea in the eighties
the two dramas talks about youth and love relationships

Basically the two dramas involves the same tunnel that takes people to another time line
the two dramas have a criminal case needed to be investigated through time

The two dramas have the same main lead Bai yu
Both dramas are family dramas and both dramas are real life like story ,, it's more real than any reality show
Both dramas are set in the past then go forward to present

Both are Ming dynasty dramas
Both are detective dramas
Both are Bromance dramas
and both are quite good brotherhood dramas

Both dramas are historical detective dramas
Both dramas are friendship brotherhood plot dramas
Both dramas are investigative dramas

Both dramas are historical detective dramas
Both dramas are about friendship between two male leads
Both dramas are investigative wuxia dramas
Both dramas are bromance dramas

Both dramas have ghost main characters
Both dramas solve the ghost problems to go away and move on
Both dramas have funny scenes

Both dramas deal with ghosts issues and try to solve their problems
sometimes it's funny and sometimes it's dark
both dramas are enjoyable to watch

Both dramas are about ghosts and funny ghost stories
both dramas deal with ghost cases and resolve them

Both dramas about ghost stories and how the main leads resolve their problems
Both are funny and light dramas