As a fan of the forbidden step-brothers trope, I feel like Unknown is both the best and most realistic BL that tackles this situation. When compared to other BLs like Brothers and Cherry Blossoms After Winter, the character development, specifically the two main character's pasts are well developed compared to the aforementioned BLs. Which makes the viewer much more invested into the lives of Qian and Zhi. The stakes are higher after witnessing and knowing just how close as siblings they are through their shared experiences. Which is why the response of Qian sending Zhi away abroad after having been confessed to is justified and understandable. We see just how hard he has brought up his siblings all on his own and doesn't want to ruin that relationship for a romantic one. Sure, its not the first and only step=brothers BL to do this, its the only one that has shown me why instead of simply saying its because they're step brothers and its wrong.

Despite the messy beginnings of their love with Zhi's confession, when their relationship actually begins its very cute. A sweet and rewarding 12th episode showing the two happily together while still keeping their family a loving and caring one was the sweetest of cherries on top. Especially after how dramatic and messy (in a good way) the first 11 were. Overall, if you are not a fan of the step brother's trope, I don't think this BL will convince you. But if you don't mind it and are in the mood for a dramatic BL with strong messaging of family, heartfelt and interesting story, and well thought out characters. Then I would suggest Unknown for you.