David, are Miso and Girls Girls unknown enough and small-label enough to qualify as No Tiers? Miso is with Ogam Entertainment, which according to Wikip is an indie distributed by 1theK/Loen; Girls Girls are on Genie, which is under KT Corporation, a telecom giant but I don't think the label has a giant impact yet — but probably has enough money behind it to make it tier-free. I notice, though, that you're counting S.E.T, also on Genie, as No Tiers.

Miso is an even better HyunA takeoff than CLC are, though CLC has a better song (the latter provided by HyunA and associates herself, as belecrivain and I discuss upthread).