The male leads in both dramas have daughters trying the protect
the male leads are involved in criminal detective work and trying to do the right thing by their loved ones
the male leads are good at fights

Both bromance movies
Both are about two male friends protecting each other and having amazing friendship

Same male lead in both
same republican era in both
same fighting by smartness in both
they have amazing bromance ,,male friendship
also have good romantic stories not heavy on the romance

They are based on each other as part one and part two
same two male lead in both
same republican era

Both have strong Bromance
Both are rebublican era drama
Both have war against Japanese
Both have lots of Angst

Same male lead
same type of criminal cases to episode or two
same type of team of trying to solve the case
similar to each other in a lot of ways

Both Wuxia dramas
Both have journey to cultivate wuxia powers and become the best in martial arts world
Both have friendship but Heroes has more than SSS
Both have slight romance but not the main focus
SSS is slow paced though

Both dramas have undercover cops
Both dramas have undercover informant or agent who has a daughter little girl trying to protect
Both dramas have secret past of the main lead and suspicious alliance

Two dramas about undercover cops
two dramas have a cop with secret past
two dramas have police and drug cartel undercover missions

Both martial arts and cultivating dramas
Both have great friendships between the leads
Both have good fight scenes
Both angsty dramas full of adventure

Both dramas have great friendship
Both have amazing martial arts fights
both have amazing angst and whump

Same male lead
different criminal case
same production company
same action criminal genera
both are enjoyable to watch