78s...Villain's Range???

[Cobra_1878]

Villains very first hand.

PokerStars - $0.02 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

UTG: $2.77
MP: $2.06
CO: $3.92
BTN: $4.25
SB: $3.33
Hero (BB): $2.00

SB posts SB $0.01, Hero posts BB $0.02, CO posts DB $0.02

Pre Flop: (pot: $0.05) Hero has 7 8

fold, fold, CO raises to $0.08, fold, SB calls $0.07, Hero calls $0.06

Flop: ($0.24, 3 players) 2 7 5
SB bets $0.08, Hero calls $0.08, CO calls $0.08

Turn: ($0.48, 3 players) Q
SB checks, Hero bets $0.36, CO raises to $1.90, fold, Hero ???

I haven't got a clue what villain is doing....can anyone help me out? I can't call but just curious what people put villain on with no reads.