This is a story about rivers and lakes. It emphasizes the warmth of blue, but there are too many gray glooms beyond the author's control. This is also a chapter about colored characters. Each protagonist represents a color, which means various characters. It tells the story of Lan Feilan, a celebrity in the world who is full of sadness and tired both physically and mentally, and comes to an ordinary town in order to find his long-lost daughter. Here, although he has given up all his past glory and fame and is willing to live an ordinary life, others are unwilling to let him go. There are always different people who will find ways to get close to him, attack him, and use him, because Lan Feilan's own existence is a huge threat to others, including his best friend. The friendships in the past seemed to have been marked as expired, spoiled and moldy. Everyone wanted to force him into a dead end...