I understand you're looking for a write-up about the 2009 Tamil movie Kadhal Kadhai , but I should clarify a few things before proceeding.
First, there is no widely known Tamil film titled Kadhal Kadhai released in 2009. The closest notable films from that year include Kadhalil Vizhunthen (Nakul, Sunaina) or Kadhalna Summa Illa (Aadhi, Nisha). It's possible the title is a mix-up, or it refers to a lesser-known or unreleased project. Kadhal Kadhai 2009 Tamil Movie Watch Online -BEST
Second, promoting or guiding users to “watch online – BEST” often implies unauthorized streaming or piracy, which I cannot support or facilitate. Piracy harms the film industry and its creators. I understand you're looking for a write-up about