Which pack brings this moodlet?

@teennewtYes I agree. As long as my sims won't die from laughter, I wouldn't mind this. The most important reason I posted here is that my sims die in too much happiness. I want my sims to be happy a lot but don't want them to die in happyness. ☹️

Maybe do you know about this moodlet?

I started getting this sad moodlet since installing the mod.

I have no idea why my sim is getting this sad moodlet. is there a way to get rid of this? My sims are getting this moodlet very often. 5 to 6 times a day?

It's not really a sad moodlet, it's just that they're using up their inspiration.  This is customizable and you can turn it off.  It's under Emotional Inertia.  https://roburky.itch.io/sims4-meaningful-stories/devlog/63820/emotional-inertia-features

Do you have aura items around too? Also, I think if your sims have memories of being silly together and then they are just around eachother later on it amplifies it too????? The Sims in the Sims 4 really seem to have a more realistic mind of their own sometimes tbh.

@SherbmonkeyNo I don’t like my sims to get the playful moodlets, so there’s nothing causes any playful aura at home lot. Only that Jamie keeps getting whagga whagga moodlet for some reason. His traits don’t have anything related with being playful either.
Sometimes, the moodlets of the sims 4 sims don’t make sense and don’t seem to be realistic. For examples, dying from hystria or being embarrassed. I heard the sims get the +2 playful moodlet from wearing the freshly washed clothes. I don’t know why the sims have to be playful with the clean clothes on. I can’t understand why the sims die with too much happiness after marriage. These are not realistic. I wish the happy moodlet won’t boost for the playful emotion. 
Many people in real life like to joke and to be slightly mischievous but they don’t die from being playful with too much happiness in real life.