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Eun Ho's first vision was not clear...if what was shown to us was exactly what she saw...because the face of whose fate it belonged to was blurred. However, if you look closely you will see it was SY's...which was confirmed by the deity when he said that for SY, the fate that he was born with was " to rise high and burn out quickly" while for WS, his fate was to live a "long and difficult life". Her second vision...after WS's accident...clearly showed that SY was the one who will become famous. Did the accident caused their fates to change? From what the deity said, it didn't. Why? Because it didn't matter how they got there...such as the accident...as long as the end result was for them to lead the lives that they were fated with...until Eun Ho switched it around.

The deity said that Si Yeol's fate was "to rise high, but burn out quickly" while WS's was to have a "long and difficult life" ... which meant that they were both living their fated lives before Eun Ho's switched it around. Now to revert it back, she has to kill Si Yeol with the dagger before WS dies...which in turn will let her return to her 9-tailed life.

Eun Ho's vision (if what we saw is exactly how she saw it) did not clearly show that WS was the one fated to be famous...the face was blurred...but after rewinding and pausing several times, I believe it was actually Si Yeol's fate she saw. This is actually confirmed in episode 10 when the deity said that Si Yeol's fate was "to rise high, but burn out quickly" while WS's was to have a "long and difficult life"...until Eun Ho's switched their fates to what it is now.

I think there was theory going around about those were the memories that Si Yeol will lose once his fate is changed back.

I believe it was explained in episode 1 around 44:50 where there were only 2 choices for a 9-tailed fox.