To be honest, It's kind of raw and the pacing's rather off, with absolutely no explanation about the setting whatsoever. It's like the author just decided that the summary is enough, the readers already know the drill, so they don't even bother with foreplay...I mean, with setup. Like, wait just a minute, who are these people!?
HOWEVER, it has a great advantage in that these squabbling siblings seem to be pretty nice dudes overall. I'd expect from the premise that this would be a house of rapey, pushy, looking-down-on-the-dirty-commoner two-faced idol types, but they actually don't seem to do that at all. Only the main love interest is a bit on the kissy side (lol).
I've seen better. I've seen MUCH worse.