diagnose the present
There was a reason Kara left Metropolis to become a firefighter at National City, and for three years, she'd been doing pretty well. That was until her past came barging back into her life in the form of Lena Luthor.
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"Good to see you again, Lena."
"No, it's not, Kara."
"No, no, it's not. But we will be seeing each other, like it or not."
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or Kara is a firefighter and Lena is a doctor, and they never expected to be back in each other's lives until they are, so it's Complicated with a capital C.