Ok Rae-yoon has five losses against five opponents on his MMA record. For a list of Rae-yoon's best fights, refer to "Best fights of Ok Rae-yoon".
On July 6, 2024 Ok Rae-yoon fought Alibeg Rasulov in a lightweight title fight for Rasulov's ONE Championship title. Rae-yoon was 33 years old and with a record of 16-5 (5). Rae-yoon lost the fight via 5-round unanimous decision.
On August 26, 2022 Ok Rae-yoon met Christian Lee in a lightweight (ONE Championship) title defense fight. Rae-yoon was 31 years old and with a record of 15-4 (5), and Lee was 24 years old and with a record of 15-4 (14). Rae-yoon lost the fight via 2nd-round TKO and lost the title.
On March 2, 2019 Ok Rae-yoon faced off against Tom Santos in a lightweight bout at age 27. He was coming in with a record of 11-3 (4). Rae-yoon lost the fight via 5-round unanimous decision.
On November 27, 2017 Ok Rae-yoon faced off against Burenzorig Batmunkh in a lightweight bout at age 26. He was coming in with a record of 9-2 (4). Rae-yoon lost the fight via 2-round unanimous decision.
On April 5, 2015 Ok Rae-yoon faced off against Song Yadong in a featherweight bout at age 24. He was coming in with a record of 2-1 (1), and Yadong was 17 years old and with a record of 4-1 (1). Rae-yoon lost the fight via 1st-round KO.