Giant (2010)

Have many similarities.
Both of them about siblings who suffered in childhood because of one devil villain who destroyed their family. Then, they grow up and have revenge towards the villain.
Both of them also have background of 1980s-1990s

Aside from family revenge things, they have other different themes.
East of eden involve switching brothers at birth and their consequences in their future life

All involves three siblings separated when they were young due to the death of their parent. They met later both have desire to get revenge

Both dramas is about three brothers who reunite after many years, ever since the death of their parents. Both has same main actor Lee Bum Soo, and also has general similar feeling.

This two amazing drama was come from same writernim. So I highly recommend to watch it too, because their similarities

The plot is really similar, brothers seeking revenge for the death of their parents.

both dramas have similar vibe and stories are kind of similar too.
in both dramas ML are similar type and he wants revenge ( a nobody against a big corrupted company).
anti heros/villains are similar too, even visually, young rich spoiled guy with high ambitious and questionable morality.
ML and anti hero are enemies and their war is quite similar in both dramas.
spoiler:
ML goes in prison in both dramas.
romances have also similarities, ML and antihero love same girl. after some time one of them moves on and falls for another girl (sister of his enemy)

Both dramas involve a fair amount of action and an interesting plot, with romance. lots of twist and turns, plot when you never know what happens next.

Romance has somehow similar feel, man madly in love with woman and doing whatever it takes to get her back (there are more details similar, but I'm trying not to say spoilers), he never gives up on her though he has much reasons for it. So if you liked one, you would appreciate another, (I'm talking about main romance of MBB and anti hero SML's romance in Giant, which is best part of Giant )

For my taste romance in Giant was better, though overall as drama MBB was better.

History of the Salaryman is the modern cousin of Giant. Both are similar in narrative structure and storytelling patterns but HotS is comedic in nature while Giant is an epic melodrama.

Both dramas are about 3 siblings(two brothers and one sister) where villain destroyed their family,as result, they get separate.

Similar era (gangster and politician join hand in hand, the importance of constructor), very similar background music (was it even the same?), similar style of presentation, lastly they tackle similar theme (injustice, rich people do bad things because they're bad while poor people do bad things because they have to) in a similar way

The intensity of the situation is similar as well as having amazing soundtracks in both dramas. Both have their family ruined by the main villain and takes revenge. The romance between the main couples are based off a similar scenario as well as having a happy ending. They would encounter one another without any problems then their relationship starts becoming a problem once they gradually know the truth to the whole situation. Even when they're not meant to be, the main hero would do whatever it takes to help out the main heroine because he still loves and can't forget her. Both revolve around business and the company, but Giant includes more action and is based off in the 1970's while Bride of the Sun is in the present.

Both dramas are from the same writer and both have many actors in common. Some themes are featured in the two dramas, like wars for power and money, revenge and betrayal. The writing style is similar, except Giant doesn't have the humor/comedy situations factor.

-Both has Conglomerate families that contribute to the rising industries in South Korea before the 21st century.
-Main leads goal is revenge
-Both story spans over 2-3 generations