The so-called "thrift room" or "big fat" that induces savings by sharing one's consumption expenditure in a group message room.

In this Messe region of thousands of people, there is an outpouring of spending advice and saving know-how, but how did such a space come about?

They don't easily allow you to have a cup of citron tea, give you tips when you want to eat bubble tea, and even sting when you say you're going to watch the latest movie.

Here are some Kim Min-Jae-level defenders who block your overspending.

I even draw emoticons like this.

This is a KakaoTalk open chat room where you share your consumption expenses and induce savings.

Some places have more than 1,000 participants, so why are people gathering?

[Na Kyung Kang/Job Preparation Student: I have to quit the company and save money, so I thought this would be a fun way to save money.]

[Meadow (pseudonym)/College student: I went in because I wanted to hear a funny joke, but I think I can save myself by going into a room where I set a little goal and do it in earnest.]

It's not just fun, it's real savings.

[Kang Na Kyung/Job Preparation Student: If I don't buy outside and eat at home, I post 'I spent 0 won today'. Then they give me a lot of praise. I think I can save by eating home food again to get such praise.]

[Black tea (pseudonym)/Job preparation student: In the case of my room, I add up all the amount I spend per day and write it after the nickname, and I think a lot of things make me think about whether I really should spend it, saying, "I've already spent this much."]

After listening to the reviews, I'm more curious, and the production team participated in it themselves.

[Ricky/SbsNews PD: I recently bought a box of non-alcoholic beer to drink after work, so I'll take a look at what they (chat members) are saying.]

Then sharp advice comes pouring in in real time.

I feel like I have to refund it right away.

But who the hell made this frugal room?

I got in touch with a large thrift room operator.

It started with a small curiosity.

[Kim Jung-hyun/Economy Room Operator: People are curious about how they spend their money, and we just made it with the idea of sharing our spending with our friends online without shame, but we didn't know it would be like this at first, but I was surprised when so many people suddenly came in. There are many people like this.]

There is also an opinion that it should be seen as a culture, not just a fad.

[Handa Hye/Research Fellow, Consumption Trend Analysis Center, Seoul National University: Now, when more than 500 or 1,000 such participants post their consumption in the chat room, feedback comes back immediately within 1~2 minutes at the latest. It can be seen as a play culture that relies on anonymity and consumes real-time communication feedback as volatile content.]

As many people gather, there was something to think about.

[Handa Hye/Research Fellow, Center for Consumer Trend Analysis, Seoul National University: There is a lot of self-help in saying that it is a big fat. I think most people will agree that it is an expression that can make the listener feel a little uncomfortable, excessive, or uncomfortable. My personal wish is that you could use the expression "thrifty room" or "no spending room" in a pretty way, but maybe you might think that is a little uninteresting.]

Can this burlesque and popular thrift room continue in the future?