More than Blue: The Series revolves around the journey of music producer Wang Po Han and his assistant An Yi Qi to find the copyright owner of the mysterious song for their artist, A-Lin. They also came across a diary belonging to K who is the producer of the mysterious song and traveled into the life story of K through the diary. The diary tells the story of K and Cream, two orphans who journey through life and share experiences in sadness and joy together. However, K is diagnosed with fatal leukemia cancer. Knowing that Cream's biggest fear is to be left alone, K keeps the fact that he has terminal cancer a secret.

王淨Sung Yuan-Yuan / Cream

范少勳Chang Che-Kai / K

王柏傑Wang Po-Han

邵雨薇An Yi-Chi

姚以緹Yu Chen-Hsi / Cindy

曾少宗Yang Yu-Hsien

Chen-yu HouModel

鍾岳純Teacher

陳雪甄Cream's Aunt

范姜泰基Boyfriend of Che-Kai's Mom

邱昊奇Lai Chun-Chieh

王可元Su Kuo-Pei

王如茵Hsiao-Ting

吳昆達Che-Kai's Dad

Zhe AhnJen Kuang

葉靜涵Yu-Hsien's Blind date

Esther ChenAmber

戴昆憲Director Hsu

Tang HanB&B owner

柯恩Doctor

Rosa WenBridal shop clerk

邱志宇Oscar

何潔柔Cream's Sister

李芸嬋Police

李宛儒Anchor

A-LinA-Lin

白潤音An Ke-Le

張詩盈Che-Kai's Mom

Ray YuDelivery person

馬念先Chi / Mr. Chi

陳妤Hsiao-Kuai

Phoebe YuanKung Li-Na

李冠毅Pang

魯文學Yu-Hsien's Dad

蔡嘉茵Bonnie

李英宏Dr. Hsie