Both drama are republican era drama ,, both fighting Japanese occupation of china
Both have strong male lead who endure so much loss
both have good bromance and a traitor

Both have the concept of the grim reaper
Both have suicidal souls turn into reapers
Both have individual cases of people to save from death

Both drama are about a Psychological criminal cases
Both dramas have a detective with close relationship to the suspect
Both dramas have trauma from childhood

Both drama are about psycho killer and detective solving his cases
Both drama have psychological trauma and brutal cases

Both drama deals with a kidnapped daughter and both leads try their best to find their daughter and fight for her life

Both dramas are detective dramas
Both dramas have older detective and younger partner solving criminal cases

Both dramas are detective dramas solving criminal cases
Both dramas have good partnership between older detective and younger profiler

Both are detective dramas solving criminal cases with psychological aspect for it
both have good partnership between the male leads

Both show are detective dramas to criminal cases with friendship and partnership for the leads
Both have unique angle to criminal cases

Both have friendship and bromance ,, both have friends fighting then taking care of each other to help each other succeed but I don't want to be brothers with you is more to the family than sports

Both are family dramas and both have adopted siblings Bromance or brotherhood
both are very realistic dramas not fantasy

Both have good Bromance and brotherhood ,, both have teenagers trying to succeed in some sport and both have amazing friendships