Great example and that sounds like a very supportive group of friends 🙂 Glad you liked the expression this time.

Great example with “closely-knit.” Just a few suggestions:
– “Many people in Korea live in apartment buildings. They usually have over 15 floors…”
– “It is not common that people have a chance…”
– And finally, instead of “know”, you might want to use the phrase “get to know each other.” To “know” someone is simply to know the perosn’s name and maybe to have said hello once. But to “get to know” someone is to learn more about the perosn’s life and develop a relationship. I think that’s what you want to communicate here.

This is a good example, but we usually use a “to be” verb with closely-knit. You could say, “When we work in a squad model, our team is closely knit for the duration of the job.”