i really can't describe my feelings towards this drama

i kind of like and dislike at the same time

but for me sometimes it's so predictable and sometimes not
at the beginning the first 5 eps were completely away from the main story
and was boring i thought they are going to fill the drama with just side crime cases
then every thing begin to connect and make sense

but i saw the main reason for the serial killer for his crimes wasn't logical at all
for someone who chooses his victims carefully this was really nonsense

and what provoked me a lot the body case for dead people they found
every one knows that the dead body after 2 days max. should stiffen at the same pause they found on
how come they can extend it easily

the character development for all of them was nice except Dae hwan
i hated him from the beginning till the end and i see that he should be punished for being violent

the end was happy in a sad weird way but somehow it carries a message

(wherever your happiness is, Stay and it will be your reality)

some how doesn't make sense for me :/
He chose the delusion, to stay happy