There are many team discussion rooms in the IC commercial building, just like the bunker laboratory where people studied science underground in the last century. In the basement of the business building, there is not only a counter where you can buy breakfast and lunch but also many spaces for group discussions, they are called vaults. They are mostly semi-closed, the only trouble is that reservations are required, and online booking channels are hard to find. From Monday to Wednesday, many people are occupying the space for self-study or preview. On Thursdays and Fridays, however, there are fewer people, so you can find an empty vault room without a reservation. I’ve been kicked out several times by people who booked because I didn’t make a reservation, it’s a shame, hahahaha.