Kai real name Kim Jong-in and Krystal real name Krystal Jung confirmed their relationship on April 1st, according to Soompi.
But now I see that it's Taemin who's stuck.
Therefore, it is safe to assume that she is single as of the time of writing.
Only write on official homepage!! Everybody can have a hair layer.
Their fans also thought that Kai and Krystal had similar taste and the same vibes in their fashion choices.
For both, there may possibly be an inward struggle between their outward personas Kai and Krystal with their inside selves, Jongin and Soojung.