"I Don't Know Why" is the second Japanese single by CNBLUE. It was released on September 16, 2010 with "I Don't Know Why" serving as the single's title track.
Track list[]
- "I Don't Know Why" - 3:44
- "Lie" - 3:49
- "Lie (Inst.)" - 3:47
- "I Don't Know Why (Inst.)" - 3:45
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