BLACKPINK’s Jisoo Names This Celebrity As Her Dieting Competitor

BLACKPINK’s Jisoo and Seo In Guk are caught up in a surprising dieting rivalry during their drama shoot.

The two stars are pushing each other to stay disciplined on Boyfriend On Demand. Jisoo admitted Seo In Guk unintentionally became her “dieting rival.”

When Seo In Guk lost weight, Jisoo felt the pressure to tighten her own diet. But when he gained a bit, she relaxed.

A fan on Twitter reacted to this funny rivalry moment:

아니 서인국이랑 지수가 왜 다이어트 라이벌임 대체ㅠ
한명 살 빠지면 위기의식 느낀다는 게 개웃기네 pic.twitter.com/q6E1NFSJWN

— ٕ (@zhezxe) March 5, 2026

Jisoo shared:

Jisoo: “He’s starving recently. He said that his goal was to lose 4kg (8.8 lbs), and just now, he told me that he’s left with 3kg (6.6 lbs). He already lost 1kg (2.2 lbs). He’s my rival. I have to lose weight too. I thought to myself, ‘he already lost 1kg? He’s not an easy one to beat.’”

Seo In Guk also confirmed the back-and-forth:

Seo In Guk: “As we filmed Boyfriend On Demand, when I gained some weight, Jisoo felt more comfortable, but when I lose weight, she feels threatened.”

Jisoo added:

Jisoo: “Yeah, I get anxious.”

With cameras adding ten pounds, no wonder both are so motivated to shed pounds fast.

Check out the official trailer below.