29 Aug 1998
Cho In-joo beats Gerry Penalosa via split decision 12/12
Super Flyweight (115 lb)
Cho In-joo becomes the WBC Super Flyweight world champion
10 Jan 1999
Cho In-joo beats Joel Luna Zarate via majority decision 12/12
13 Jun 1999
Cho In-joo beats Pone Saengmorakot via knockout 8/12
5 Sep 1999
Cho In-joo beats Keiji Yamaguchi via unanimous decision 12/12
2 Jan 2000
14 May 2000
Cho In-joo beats Julio Cesar Avila via unanimous decision 12/12
27 Aug 2000
Masamori Tokuyama beats Cho In-joo via unanimous decision 12/12
20 May 2001
Masamori Tokuyama beats Cho In-joo via knockout 5/12