이거 광고 아니고 내돈내산이야

The line, explained

Scroll through Korean beauty YouTube, food blogs or Instagram and you will see four syllables in thumbnails, titles and hashtags: 내돈내산. It is a promise of honesty. The reviewer is saying that no brand paid for this, no free sample, no hidden deal; I spent my own money, so you can trust my opinion. Today's line is a creator holding a new cushion compact up to the camera and getting that disclaimer out of the way before saying a single word about the product.

이거 is the casual form of 이것, "this thing", and in speech it usually drops its particle. 광고 is "advertisement", and 아니고 is 아니다, "to not be", with -고, "and". The pattern N 아니고 N is how Korean says "not X but Y": 광고 아니고 내돈내산, "not an ad, but my own purchase". You will hear the same shape all the time in everyday talk, as in 농담 아니고 진짜야, "I'm not joking, it's real".

내돈내산 compresses a whole clause. The full phrase is 내 돈 주고 내가 산 것: 내 돈, "my money", 주고, "giving", 내가, "I", 산, "bought", from 사다, "to buy". Take 내, 돈, 내, 산 and you have the word. It is a perfect example of the Korean habit of clipping long phrases into four tidy syllables, like a sticker you can slap on anything. With 이야, the casual "is" after a consonant, the ㄴ links forward: nae-don-nae-sa-ni-ya.

The word took off in 2020, when several big Korean YouTubers were caught in 뒷광고, "back-door advertising", presenting sponsored products as personal picks. Audiences felt betrayed, and creators began labelling honest content. Now 내돈내산 works as a noun with 이다, as a modifier in 내돈내산 후기, "a self-paid review", and as the hashtag #내돈내산. Its opposite is 협찬, "sponsorship". Friends use it jokingly too: showing off a new bag with 내돈내산이야 means "nobody bought this for me".

Swap what it isn't, and the honesty stays: 협찬 아니고 (not sponsored), 선물 아니고 (not a gift), 공짜 아니고 (not a freebie), 체험단 아니고 (not from a review programme, the Korean system where bloggers get free products in exchange for posts). Each one rules out a different way of getting something for nothing. The next time you buy something you love, try captioning it #내돈내산; Korean followers will read you instantly as a reviewer they can trust.