He took part in the 2017 Heavyweight Grand Prix, but lost to the eventual winner Antonio Plazibat in the quarterfinals.[3] He bounced back with a TKO win over Shinya Uemura, during Krush 89.[4]
K-Jee participated in the 2018 K-1 Cruiserweight Grand Prix, for the inaugural K-1 Cruiserweight title. He beat Brian McGrath by TKO in the quarterfinals, but lost a unanimous decision to Sina Karimian in the semifinals.[5]
K-Jee won his next two fights, knocking Yuki Kudo out with a flying knee during Krush 97,[6] and Hitoshi Sugimoto with a right hook during Krush 101.[7]
He fought for his first major title during Krush 104, when he fought Rui Hanazawa for the Krush Cruiserweight title. He defeated Hanazawa by a second round TKO.[8][9]
K-Jee was scheduled to fight Hisaki Kato in December 2019. Kato won the fight by a second round TKO.[10] The two of them fought a rematch three months later, during Krush 112, which was to be K-Jee's first title defense.[11] K-Jee won the fight by a first round knockout.[12]
K-1 Jee was scheduled to fight Sina Karimian for the K-1 Cruiserweight title during the K-1 World GP event in Fukuoka. He won the fight by TKO, forcing Karimian's corner to throw in the towel midway through the first round.[13] Despite knocking Sina twice in the first round, K-Jee would lose the fight by a second-round knockout.[14]
After being badly hurt near the beginning to the second round, K-Jee staged a comeback victory, winning by way of a low kick knockout.[15]
K-Jee was scheduled to face Seiya Tanigawa at K-1 World GP 2021 in Osaka on December 4, 2021.[16] He was later forced to withdraw from the fight. K-Jee participated in the 2022 K-1 openweight tournament, held at K-1: K'Festa 5 on April 3, 2022. He faced the Krush cruiserweight champion Mahmoud Sattari in the quarterfinals.[17] He lost the fight by a first-round knockout.[18]
K-Jee faced Seiya Tanigawa at K-1 World GP 2022 in Fukuoka on August 11, 2022.[19] He lost the fight by unanimous decision, after he was twice knocked down, once each in the second and third rounds.[20]