The Bond (2021)

The setting and the context are different but I've found the oldest brothers in both dramas really similar; the way they sacrifice themselves for the sake of the youngest siblings and try to maintain a certain stability and the bond among them.

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

they are similar in the story
Brother taking care of his siblings and suffering the most for them
But I liked the korean one more to be honest

Both shows are centered around a family of siblings living together and the struggles they face in their daily lives. Only difference is that in "The Bond" the siblings still have a father(if you can even call him that) alive while "Under One Roof" the oldest sibling is the father figure to his younger siblings.