After researching on legit sellers and checking feedback, I settled for sellers f2plus1 and rainbow-japan and I am really pleased with everything!
f2plus1 is the go-to seller for popular Korean cosmetic brands such as Etude House, Holika Holika, Skin Food and so on (Look at the 35000+ feedback will ya?) who not only sells for really good prices, but also offer wholesale and 2pc/3pc listings. Rainbow-Japan doesn't have as much feedback but all their feedback is from real customers (You can tell with the amount of detail in the reviews). As they are a much smaller group, they really take time to personalize all their orders.
I started out small, one product from both sellers.
From f2plus1, I purchased the Innisfree Skinny Waterproof Microcara and from rainbow-japan, I purchased the Eyemazing x Amoyamo eyelashes in Rockabilly. Both arrived in small parcel boxes.