One was born without parents, earning money for himself, just a smile to accompany him as his friend. While the other one has everything but without a smile.
One night, they meet each other in a small coffee shop, with warm milk and a warm smile again and again, continuing each night. Before they realize it, they have become each other's breath. Become an indispensable thing like oxygen.
This is a love story between a 4th-year student of Engineering, Gui Jirayu, who worked at a small cafe, with a freshman of Music, Solo Siwarokin, who always came to have warm might every night, otherwise he won't be able to sleep.