Han previously challenged Nong-O Gaiyanghadao for the ONE Bantamweight Muay Thai World Championship.
[3] He picked up his first promotional win with a unanimous decision over Stergos Mikkios at ONE Championship: Beyond The Horizon on September 8, 2018.
[5] He extended his ONE winning streak to three with a first-round technical knockout victory over Azwan Che Wil at ONE Championship: Conquest of Champions on November 23, 2018.
[6] On February 16, 2019, Han Zihao faced Nong-O Gaiyanghadao for the inaugural ONE Bantamweight Muay Thai World Championship.
the bout agreed to moved to the featherweight division (145–155 lbs) where Han was fined 30%, which went to Ferrari Fairtex.