BANK Nifty Deep ITM 28000 put call 6Lakhs OI, what does that mean?

I have seen 28000PE call for 28FEB banknifty expiry is having 6.16Lakh OI, what does that mean ? (bank nifty is going to above 28000 at the end of the expiry) and in the sellers point of view what are the scenarios he can profitable?

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