Bound by an inescapable sense to carry out his late master’s legacy, a masked hitman becomes a rising gangland player with the sole purpose of taking down the very criminal organization who employ him.

Somehow missed this. Agree with Richiev. However, add details to make this stand out since the general story has been done many times before. That might be more about the protag, when this is, where, etc.

"Masked" gives this a superhero feel, but nothing makes that seem necessary or at least worthy enough for the logline. Clarify if the mask is important; otherwise, cut it.

"Bound by an inescapable sense to carry out his late master's legacy..." An inner feeling does not make for a good inciting incident.
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"When his master is murdered by the very organization he works for, a determined hitman will stop at nothing get revenge for his master by taking down his backstabbing syndicate."