Dear Princess is the Korean Prism Show Agency that manages PURETTY. Not much is known about it, except for PURETTY and Dear Crown, and PURETTY's manager is Mishil. Yun-su also is part of Dear Princess, and designs for them.
Dear Princess is a Prism Show Agency, same as Pretty Top. Yun-su is a designer in Dear Crown, which is So Min's favourite shop. Yun-Su is in charge of PURETTY's outfits, including their Prism Show outfits and their shuffle team outfits as well as the perfume PURETTY and the shuffle teams used.