Thriller: the Strangeness Caused by Free

If I told you that there was a free event where you could get a 7-day trip without paying a penny, would you go? As someone who has been there, I will tell you the truth. The person involved said: I regret it very much. I want to go home. I'm afraid... Oh, I'm pretending! Don't be greedy for small gains, because there is no free lunch in the world... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.