Kim Yerim and Mark Lee are best friends for years. They've been spending their lives together for so long to the point that they think nothing could ever change their friendship. After long trainee years, they finally debut as the idols from SM Entertainment. Yeri joins Red Velvet in 2015 and Mark debuts with NCT a year later. The fact that they are both becoming a successful idol still couldn't change their friendship. 99's Story will tell you how the friendship between the 99 liners gets stronger each day and also, how a little thing which never comes to their mind could change their friendship into something that they won't ever imagine. [06/13/2018ㅡ01/31/2019]

Everything happens in the chatroom.

The life of Mark Lee, a guy who never has a girlfriend throughout his twenty years of life, suddenly changes when Kim Yerim comes into his life. It all started when Yerim starts to live in his house. Days by days go, when the feelings of love start to develop, but people who are involved there can't do anything about it. [cover: got the art from pinterest and edited on canva]