There were couple of reasons.. these guys were contracted under rival networks. Chang fought on KBS while Yuh fought for MBC so it was no different than HBO and Showtime fighters..
Second, ( although I believed these guys were pretty much equal) the general public in Korea at the time considered Yuh as a level or two below Chang so there wasnt much of a push for this bout to happen, and on top of that, the korean boxing culture was very nationalistic and they favored having more champions rather than having domestic showdowns between the top guys..
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