Two different lives, one destiny. The first one has no parents, living alone and striving to earn for himself but always have a smile on his face. The other one has everything in life and has nothing to ask for except for someone that will put a smile on his face. One cozy night, the two meet each other in a small coffeehouse, with warm milk and warm smiles that continued night after night after night. Neither of the two expected that they have become each other's breath, they became one's own vital thing – like Oxygen. They became each other's life support. This is a romantic love story between a fourth year Engineering student, Gui Jirayu, who works at a small coffee shop and a freshman of Music Department, Solo Siwarokin, who can't sleep every night without having a warm milk from that small café – the very place where they found their destiny, and where they discover their much needed Oxygen.