Both are based on revenge and injustice practiced towards the main leads from the ones they trusted.
Firece villains and their psychopathic attitudes.
Fight scenes ??
Both dramas teach the importance of teamwork and friendship with people you meet by coincidence. They show that date will bring you the right people to trust at the right time.
Both dramas show that trusting people who we work with will lead to a true friendship and support Wall.