Yep, if what he actually wants is an idealised, fantasy version of Jiwon he definitely shouldn't date him. (Sorry, somehow I ended up on Team Jiwon... it's lonely)
I also wished that Alex would start DG like a human being and not somebody beneath him. He's like totally walking all over him and of course DG will comply because of his (just confirmed) feelings for Jiwon.
DG deserves someone kinder and gentler than alex :(