Accidentally Used a Booster

I ended up rushing the event from day one without even unlocking the highest efficiency stage... I was sure I had plenty of time for this event when I was pulling on the gacha earlier... Thanks to that, I'm frantically munching on apples now.... What am I even doing at this hour... It's my fault, but still ㅠㅠㅠ Meanwhile, my computer decided to act up again and froze. Wonder when it'll start working again... I really want to turn it off and sleep... I haven't even done much, but I'm so tired...