Kazha's Eating Spree: A Mukbang Adventure!

In the Korean comments

An ordering joke reads “Big spender Kazuha went for it without realizing all the ingredients would arrive, hahaha” (fandom). A continuity reference adds “I'm telling you, Zuha is the group's eating champion, ever since the first DAY OFF, haha” (fandom).

What the words mean

큰손 (big spender or generous orderer) refers to the scale of ordering, not hand size or proven wealth. The title's suggestion that she could eat the whole restaurant is exaggeration, not a record of what she consumed.