Responses

I don't think you're missing anything. As you said yourself liai is overrated and you don't need to read it to know what's going on here cause so far they're two separate stories. If you need a background, in ch. 5 of other series love is a fantasy it's briefly mentioned that Byul and Siwoo were friends in kindergarten. That's all
i never finished reading love is an illusion because it was just so… rapey? and honestly just overhyped. but i feel like im missing so much info now im just gonna pretend that this is an entirely different series