 If you liked
Totally Captivated
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 ...then you might like
Saezuru Tori wa Habatakanai
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Both involve with Yakuza, both have a bit of psychology going on with mild dark pasts (TB, Saezuru definitely has dark pasts) and both are very interesting. Highly recommended.
If you're looking for yakuza themed BLs, then these two works are similar. There's enough yakuza shenanigans happening in them to keep you on the edge of your seat. However, that's where the similarity end.
While Saezuru is a serious yaoi that has complex characters (with beautiful art), Totally Captivated is a light hearted Shounen Ai manhwa whose focus is more on comedy and the romantic development between the MCs (with pretty decent art)