2013.01.23 SBS 한밤의 TV연예 Midnight TV Entertainment

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YH: From the beginning, we'd never thought of using stage names. Because we like our names, we used our real names.

Q. Any difficulties during overseas activities because of your real names?
MH: In Japan, the pronunciation of "Minhyuk" was sometimes difficult for fans so they'd say "Minhyoku".
YH: It becomes Yongfwa, Yonfwa.

I think that once you become popular and cool, the name also begins to sound cool. I think it becomes an identity by itself.