Early career Kim started her professional MMA career in 2013 and fought primarily in South Korea and Japan. Kim acquired a six-fight winning streak and became the
Jewels and Gladiator women's bantamweight champion prior to joining the UFC.
Ultimate Fighting Championship Kim made her UFC debut on June 17, 2017. Kim faced
Lucie Pudilová at
UFC Fight Night: Holm vs. Correia in Singapore. She lost the fight via unanimous decision. Kim next faced
Justine Kish on January 27, 2018, at
UFC on Fox: Jacaré vs. Brunson. She won the fight via split decision. Her third fight came on June 23, 2018, at
UFC Fight Night: Cerrone vs. Edwards against Melinda Fábián. She won the fight via split decision. Kim faced
Antonina Shevchenko, replacing injured
Ashlee Evans-Smith, on November 30, 2018, at
The Ultimate Fighter 28 Finale. At the weigh-ins, Kim weighed in at 130.5 pounds, 4.5 pounds over the flyweight non-title fight limit of 126. She was fined 20 percent of her purse, which went to her opponent Shevchenko. The bout proceeded at catchweight. She lost the fight via unanimous decision. Kim faced
Nadia Kassem on October 6, 2019, at
UFC 243. At the weigh-ins, Kim weighed in at 128 pounds, 2 pound over the flyweight non-title fight limit of 126. Kim was fined 30% of her purse, which went to her opponent Kassem. In a fight where Kassem drew heavy criticism for faking a respectful glove touch to deliver a kick, Kim won the fight via technical knockout in round two. Kim was scheduled to face Sabina Mazo on December 21, 2019, on
UFC on ESPN+ 23. However, on November 1, 2019, it was reported that Kim was forced to pull from the event due to undisclosed injury. Kim was scheduled to face
Alexa Grasso on June 27, 2020, at
UFC on ESPN: Poirier vs. Hooker. However, due to travel restrictions for both fighters due to
COVID-19 pandemic, the bout was rescheduled on August 29, 2020, at
UFC Fight Night 175. She lost the fight via unanimous decision. Kim was scheduled to face
Poliana Botelho on May 1, 2021, at
UFC on ESPN 23. However, Kim pulled out of the fight on March 22 citing injury and was replaced by
Mayra Bueno Silva. Kim faced
Molly McCann on September 4, 2021, at
UFC Fight Night 191. She lost the fight via unanimous decision. The back-and-forth bout won both contestants the
Fight of the Night bonus award. Kim was scheduled to face
Poliana Botelho on January 22, 2022, at
UFC 270, but Botelho pulled out instead and the pairing was scrapped. Kim faced
Priscila Cachoeira on February 26, 2022, at
UFC Fight Night 202. She lost the bout via controversial unanimous decision. 14 out of 15 media scored Kim as the winner of the fight. Along with Cachoeira, Kim was awarded the
Fight of the Night bonus award; her second overall. Kim was scheduled to face
Mariya Agapova at
UFC 277 on July 30, 2022. However, Agapova was forced out of the fight due to knee injury and she was replaced by
Joselyne Edwards. She lost the fight via split decision. Kim was scheduled to face Mandy Böhm on February 4, 2023, at
UFC Fight Night 218. However, Böhm was forced to withdraw before the event start due to illness and the bout was cancelled. The pair was rebooked for
UFC on ABC 4. Kim lost the fight via a split technical decision (27–28, 28–27, 28–27) after receiving two separate point deductions for fouls, the second of which resulted in the fight being stopped part way through the third round after Böhm could no longer continue. After the loss, it was reported on May 16 that Kim was no longer on the UFC roster. == Championships and accomplishments ==