The UANL Tigres striker made the most of his opportunity in Mexico's senior national team, scoring his first international goal just before half-time and then adding two more in the final five minutes of the game to cap off a stunning debut.
With Pulido running riot and Oribe Peralta scoring Mexico's opening goal on Wednesday, South Korea were brought down to earth with a jolt, having started their tour of the United States with a 1-0 win over Costa Rica in Los Angeles on Saturday.
Hong's men started stronger in Texas, breaking through Mexico's defence a couple of times in an open first half-hour, but it was Herrera's side that broke the deadlock on 36 minutes.
While South Korea were shocked by Peralta's opener, they would have been completely stunned by Mexico's second goal in first-half stoppage time, with Pulido finishing on his second opportunity from close range, after Carlos Alberto Pena had set him up.
South Korea held on for most of the second half but in the 86th minute Pulido extended Mexico's lead, finishing off Isaac Brizuela's cross.
