River decision with flush

Full Ring Empire $100 NL

No read, because I’m new to the table. Hero has $100 and Villain has me covered.

Hero is dealt 5c 7c in SB.

Preflop: three limpers including villain from MP and Hero completes from SB with
5c 7c.

($5) Flop: Qc 8c 6d

Hero checks, EP limper bets out $3, fold, fold, Villain raises to $9, Hero calls and EP folds.

($26) Turn: Qc 8c 6d 7h

Hero checks, Villain checks.

($26) River: Qc 8c 6d 7h Ac

Hero bets $20 and Villain raises all-in. Hero???