Help Identify assassin novel

Can anyone help me identify manga/novel with the MC being an assassin or thief?

the manga/novel should be quite short, and the MC has a brother that was quite weak but pretty big. At the beginning the MC pretends to be weak and gets bullied but his brother takes the beatings for him, and at night the MC goes out to fight with an assassin getup to win money ~ i think.

Pretty sure theres a novel + manga about it but i cant seem to find it again. 

Sorry know my description is quite vague, bit of a jump in the dark here. 
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