Wales trounced Korea 34-5 as Gareth Owen, Jonathan Evans, Aled Brew and Lee Williams scored in the opening period as Wales raced into a 24-0 half-time lead.
But the score was ruled out for offside and it was Scarlets who did open the scoring after eight minutes, when Dan Evans went over the line from a Williams' pass.
The battle became more physical in the second quarter with Hayward stuffing Deron Williams at one end and Evans delivering a hard foul on Paul Millsap on the fast break at the other.