Check out the patch notes for the v17 Precursor Update here: http://maplestory2.nexon.net/en/news/article/53778/precursor-update-v17
Make sure to visit my house on North America East as I've placed every furniture correlating to trophies possible. My IGN is Mouse. I don't want to see someone else wasting merets on their own trophy house that would have identical furniture.
I have added a parkour puzzle inside my house that only a few people have been able to beat.
I'm not exactly understanding this decision of having two types of merets.
"Red Meret shop currently is composed of outfit items, emotes, mounts, etc. There's handful of items that are only in Blue Meret Shop which Style Crate will be one, super world chats, name change, gender change and more." - @NX_LAMBCOOK
So when someone buys mesos with blue merets, the merchant gets red merets. However, red meret stores have less items than the blue meret stores. I can't say much as we don't know all the limitations of red merets are. But it just doesn't make sense to me that there are different types of merets in the first place.
Next thing you know, yellow merets are a thing.