In this version .... There's no reason for Hae Soo not to love Jung .... he's all u said and more, in fact his fun straight forward personality suited her the best!!
In original SH, personalities were different... 14th was even better and cleverer than Jung .... but also, she was way more clever than Hae Soo - RuoXi admired 8th's intelligence who was more virtuous than Wook .... and fell for 4th (who was more calculating than Wang So) b/c he seemed to be able to understand her personality and freethinking ....
14th was adorable but too pragmatic for progressive and free-thinking RuoXi ... he couldn't understand why she made some of the decisions she did .... He repeatedly said "I don't understand women... I don't understand what u r thinking!" ..... So RuoXi understandably, couldn't get over a deep-thinker like 4th.
But easy-going Hae Soo should have loved the adorable Jung, who could have made her very happy!