Parasite

I see that some people say the ending is actually happy and that everything seemed to work out at the end! But i find that's not true! We can clearly see at the ending that Ki-woo is still poor and dreaming of making his message to his father comes true but did it actually happene or not? we don't know for sure! And i guess it didn't happen and that was because the reference back then when they lost their house, when the father told Kim Ki-woo that plans don't always success and that dreams never come true, so it actually does make sense. The only thing i don't like that how did actually Kim Ki-woo survive?:D I mean he has been hit twice by a huge rock in his head!! And the funny thing that the woman who hit her head by falling over the stairs is the one who died :D!