story is basically based on two priniciple
1) you and only you (no one else) can change your fate. nothing or no one in the world can take the role in your instead for the fate that is been decided for you.
2) once you are ready to let go of everything and hold no desire than only you can become actually free.

other than psychological angle i find this drama also had that deeper than thou love story ..the dynamic chemistry between the leads (so called side characters acc to fate book) which gradually ended into both of them giving up on their lives to protect the other... OMG !!! what to say i am little old school and i always long for such romance in my life ...

the only negative thing i felt was cheapness in fortune writer'character that he suddenly erase the fate and rewrite it again ... but anyway in the end that all made good sense

is it worth watching ..totally
is it worth rewatching .. of course ..may be after sometime when you suddenly want to know how fate works in your life ...