At the 2018 Winter Olympics, Lim Hyo-jun competed in the Men's 1500 m event, and is due to compete as part of the Korean team for the Men's 5000 m relay. In the heats of the individual 1500 m event, Lim placed first in a race that saw Japan's Kazuki Yoshinaga disqualified after a stumble; Hungary's Shaoang Liu, who placed fourth, qualified with Lim to the semifinals. In the semifinals, Lim again placed first along with fellow Korean Hwang Dae-heon, who placed second behind him. In the gold medal final, Canada's Charles Hamelin collided with Hwang with three laps left in the race, leaving Lim the last Korean in the field. He nevertheless finished the race seven hundredths of a second ahead of the Netherlands' Sjinkie Knegt, the World record holder, to claim the gold medal in the event; the third time in the event's history that a South Korean had placed first. Lim also claimed the Olympic record for the event, recording a time of 2:10.485 in the final, beating Lee Jung-su's record of 2:10.949 set at the 2010 Winter Olympics in Vancouver.