讲述的是主人公因为是色盲看到的整个世界都是灰色的，但是遇到命中注定的他之后通过强烈的经历开始出现能看到彩色的“Color Rush”现象，从而发生的一系列故事。

Mono由於大腦識別功能而無法區分顏色，只有 Probe的臉龐會刺激Mono大腦的一部分，使他能夠看到顏色。當Mono看著Probe的臉時，會有一種令人興奮的「Color Rush」⋯

Yeon Woo’s probe was a boy named Yoo Han, and the two developed a beautiful friendship that blossomed into romance. But as their relationship intensified, mysterious goings-on suddenly got very unpleasant for Yeon Woo, who eventually found that Yoo Han had disappeared, with his mother also vanishing. Yeon Woo vows to do whatever it takes to track down his “probe” and his mother. A classmate named Se Hyun learns of Yeon Woo’s quest and resolves to help and protect him – as a close friendship develops between the two students. But Se Hyun hides a secret, and Yeon Woo could be about to discover the truth… Meanwhile, Yeon Woo is not alone – other monos are nearer than he might think, including a female mono who is looking for her own probe. And a TV producer is also on the scene, hoping to get to the bottom of the mono-probe mystery!

יון או רואה את העולם רק באור אפור עקב עיוורון נוירולוגי. אבל כשהוא פוגש את יו האן, זה כמו מפגש גורל: יון או חווה עומס צבעים, תופעה שגורמת לו פתאום לראות צבעים דרך חוויות עזות. לצד החוויה המוזרה הללו והשאלה האם הם נועדו לאהוב, יש צורך לפתור גם את המסתורין של היעלמותה של האם.

그의 눈엔 세상이 회색이다. '신경전색맹'인 모노 연우. 실종된 엄마에 대한 아픈 기억을 안고 새 학교로 전학을 간다. 그곳에서 만난 유한의 얼굴을 보자 갑자기 쏟아지는 세상의 모든 색깔. 모노의 운명적인 상대 프로브를 만난 것일까.

Yeon-woo vê o mundo apenas em luz cinza por conta do seu daltonismo. Quando ele conhece Yoo-han, é como um encontro do destino: Yeon-woo experimenta uma onda de cores, um fenômeno que o faz de repente ver as cores através de experiências intensas. Ao lado dessas experiências estranhas e da questão de saber se Yeon-woo e Yoo-han são destinados um ao outro, há também o mistério do desaparecimento de uma mãe a se revelar.

Yeon Woo ve al mundo solo en tonos grises debido a un tipo de ceguera neurológica. Pero cuando conoce a Yoo Han, es como un encuentro del destino; Yeon Woo experimenta un destello de color, un fenómeno que le permite ver colores a través de experiencias intensas. Junto a estas extrañas experiencias y la pregunta de si Yeon Woo y Yoo Han son amantes destinados, también está por desarrollarse el misterio de la desaparición de una madre.

ยอนอูมองเห็นโลกด้วยแสงสีเทาเท่านั้นโดยตาบอดทางระบบประสาท เมื่อเขาได้พบกับยูฮัน มันเหมือนกับการพบกันของโชคชะตา ยอนอูประสบกับสีสันที่พุ่งพล่าน ซึ่งเป็นปรากฏการณ์ที่ทำให้เขามองเห็นสีสันอย่างกะทันหันผ่านประสบการณ์ที่เข้มข้น นอกเหนือจากประสบการณ์แปลกๆ เหล่านี้และคำถามที่ว่ายอนอูและยูฮันเป็นคู่รักที่ถูกกำหนดมาคู่กันหรือไม่ ยังมีปริศนาเกี่ยวกับการหายตัวไปของแม่ที่ต้องเปิดเผยอีกด้วย

Rengi görme yeteneğini sınırlayan nörolojik körlükle yaşayan Yeon Woo, çoğu insanın görmeye alışkın olduğu dünyadan çok farklı görünen bir dünyada büyüdü. Sadece değişen gri tonlarını görebilen Yeon Woo, dünyanın renklerle dolu olduğunu biliyor ama onları hiç görmedi. En azından Yoo Han'ın dünyasına girdiği güne kadar.