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Someoneyoudunno asked a question

Recommend me a good doomed yaoi manga/manhwa( preferably bl, I'm okay if it's straight couple tho).
Two sets of people that exist for the sake of each other but they ultimately can never be together. Their relationship is filled with tradegy and sacrifice. Recommend me something like this.
(+points if their personality is different from each other and yet they want to know each other better because they feel far apart from each other)