confessions of a mystic messenger addict

chatroom participation

Participating in all the chatrooms is HARD. It means knowing the times of all the chats and making sure that you're able to actually participate in them while they're open. One way to do this is by clearing your schedule for the next eleven days, the other is to spend hourglasses.
In the causal route and deep route, it costs 5 hourglasses to participate in a chatroom that's no longer open. So it's not a big deal if you spend hourglasses to participate.
However, in another story - it costs 15 hourglasses to participate in a chatroom that's no longer open. So you need to choose which chatroom to participate in wisely. This also applies if you're running low on hourglasses in any other route.
The first thing you need to consider is who was in the chatroom to interact with. If you're looking to pursue Yoosung, for example, but there was only jumin and seven in the missed chatroom: then it's not a big issue that you missed it because there wouldn't be a chance to get more hearts for Yoosung. Whereas if he was in the chatroom, you'd want to participate in it to strengthen your relationship with Yoosung.
Secondly, you should consider how many chatrooms you've participated in on the day you're on. If you've missed a lot of the chatrooms, then you should participate in it as there'll also be chances to invite guests to the party which you'll miss if you don't participate in the chatroom. This obviously means that your chances of getting a bad ending are increased which you don't want unless you're actually playing to get a bad ending.
Lastly, you should consider how invested in the game you actually are. If like me, you're invested to the point where you avoid leaving the house so you don't miss chatrooms - then you should participate to stop the stress. Whereas if it's just a game you play for fun and aren't really bothered, then you shouldn't worry about participating since it's not a big deal if you get a good ending or not.