Responses
I don't think its a reach. I've thought they look similar this whole time. I also feel like Hwan could be purple haired guy but his appearance was changed....cuz maybe he had a wish like Chiwoo. But in order to make his wish come true he had to do some little mermaid like deal and make Chiwoo fall in love with him.

y'all hwan still seems mega sus to me TT is it even the real hwan ?? i hope it is or poor baby gonna have his heart broken again
i'm rooting for him TT
WAIT YALL !! HOL AWN... this might be a reach, but what if purple haired guy turned evil since chiwoo shared his powers and he still didn't want purple hair. so now he's pretending to be hwan to fuck with chiwoo because chiwoo would never want him otherwise