"Roses have thorns, and silver fountains mud:
Clouds and eclipses stain both moon and sun,
And loathsome canker lives in the sweetest bud."
-- Shakespeare, SONNET 35
It wasn't Sana's intention to steal Jungkook away from Nayeon. Like flames suddenly flaring up, those thoughts darted through her mind. Much later in the throes of their own relationship, when Sana reflected upon her character at that juncture, did those thoughts revealed their significance. There was one characteristic of her that preoccupied her above all: her bitterness of this guilt. It had struck her at her second intimate encounter with him, but it remained inexplicable to Jungkook until he was able to see it in connection with her nonplussed reaction when he would invite her to his place or to his parent's. It was only the emotionality with which she spoke of it during one of the first dragged-out arguments that revealed the deeper elements reverberating within her. She gave him the impression that at bottom she was working against her own goal and against herself; and there is, after all, no harsher bitterness than that of a person who is his own worst enemy. In her own words, Sana felt herself menaced by a "dirty tide of muck"-- she who more than him had tried to let down her guard against those black depths.