Need help regarding my website ranking drop due to penguin update?

Hi everyone,

i have two websites related to same business and i am targeting same keywords for both websites but  last month(24th April) when Google penguin updated my 1 website ranking dropped too much before 24th April that website keywords are ranked on 2nd or 3rd page but after penguin they are not in top 30 pages.i already check keywords density and content and all remaining ON page issues all are fine.Can anybody please tell me what was  the reasons why ranking was drop of that website? any body also facing this type of problem ? now what can i do to get back that website ranking ?

Need help.....

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