Villain is a total unknown

Poker Stars, $0.05/$0.10 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

BTN: $15.61 (156.1 bb)
SB: $26.21 (262.1 bb)
BB: $5 (50 bb)
UTG: $10.56 (105.6 bb)
Hero (MP): $17.12 (171.2 bb)
CO: $10.08 (100.8 bb)

Preflop: Hero is MP with 9 8
UTG folds, Hero raises to $0.30, 3 folds, BB calls $0.20

Flop: ($0.65) T 3 K (2 players)
BB checks, Hero bets $0.40, BB calls $0.40

Turn: ($1.45) 8 (2 players)
BB checks, Hero bets $0.80, BB calls $0.80

River: ($3.05) 4 (2 players)
BB bets $2.60