This recent "trend" that has been appearing more often among female K-Pop idols is one that has been met with a fair amount of controversy.
What Netizens Think Might Follow The Controversial Under-Boob Trend: The See-Through Trend - Koreaboo
Cosmic Girls' Luda Was Inappropriately Touched By Male Backup Dancer On Stage : r/kpop
Which K-Pop Idol Wore The Under-Boob Fashion Trend Best? Vote Now! - Koreaboo
What Netizens Think Might Follow The Controversial Under-Boob Trend: The See-Through Trend - Koreaboo
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What Netizens Think Might Follow The Controversial Under-Boob Trend: The See-Through Trend - Koreaboo
10+ Korean Celebs Who Boldly Joined The Under-Boob Fashion Trend - Koreaboo
Which K-pop idols don't fit Korean beauty standards? - Quora
10+ Korean Celebs Who Boldly Joined The Under-Boob Fashion Trend - Koreaboo