Ahh now I understand the reason for the title, it's because of Mokyeon's delusional ass

Lmfaaao but if you think about it they’re both Delulu as f*ck…. Nanjo is very delusional about that brown haired twink. So technically they’re both delusional damn

Everyone is deluding each other and themselves. NanJo literally convinces himself he can "save" SeonHwa by sleeping with this shit. And he's under the illusion that SeonHwa is "better than MokYeon" even though both of those guys are shit. Etc. Etc. a circle of self delusion.