MAC Sunny Seoul is a “subtly yellow-toned medium pink with white shimmer” according to Temptalia. It is a cremesheen formula, which is my favorite from MAC. I love how creamy they are, and they are a “low maintenance” type of lipstick, making them good for lip product beginners or those who don’t want something that have the staying power of cement, but still have decent longevity.  
 
This is a permanent lipstick released last year. This isn’t the most unique shade by any means, but it is pretty.
Sunny Seoul is on the sheer side; however, it does achieve opacity. I think this color would look great on just about everyone because it is so wearable. Bright, but not overwhelmingly so.