Gee, a fourth-year university student and orphan, works at a café while studying. One night, Solo—suffering from insomnia—visits the café just before closing. Gee offers him warm milk, and Solo finds comfort in both the drink and Gee’s smile. Meanwhile, Kao spots Pu (Pree) being harassed on a rainy night and follows him. Later, Solo—now a contestant in the university’s Star & Moon contest—sits outside the closed café, waiting…

Kim, a fujoshi and coworker at the café, fantasizes daily about her favorite customer couples (CPs). When one of them is secretly photographed, they confront Kim, suspecting her. At university, Solo isn’t interested in the festival, but asks Gee to come support him. Kao, meanwhile, tries to get Pu to attend the after-party. Solo plays guitar, and Kao sings… but who are they really singing to?

With the festival over, an after-party is held. Solo doesn’t want to go, but Gee convinces him. At the venue, Solo is found drunk, and Gee gently cares for him, taking him home. Later, Kao’s dinner plans with Solo fall through, and he runs into Pu at the supermarket. Despite being crowned "Moon" of the university, Solo is left alone after a photoshoot, treated differently.

Gee saves Solo from being drugged just in time. But then Solo stops coming to the café, worrying Gee. Meanwhile, junior student Kay begs to work at the café with Gee. Kim collapses and is hospitalized; Pet, unable to bear her condition, goes to speak with Kim’s brother, Kem. Just as Solo returns to visit Gee, the two finally meet again.

After a period of absence, Solo visits the café before closing, inviting Gee to a volunteer camp without explanation. Gee is left confused. Kim’s condition worsens after a fight with Kem. Pet tries to lift Kim’s spirits, leading to an emotional moment. Meanwhile, Kay aggressively flirts with Gee at camp, bringing Solo and Kay to a boiling point. Gee turns to his friend Bie for advice.

After openly sharing their feelings, Solo learns that Gee will be away on a 3-month internship and asks him to live together. Meanwhile, Kao is assaulted at the faculty building while trying to meet Pu—and rumors wrongly name Pu as the attacker. Pet is misunderstood by Kim and follows her BL advice to resolve it. Solo and Gee begin living together, but one night, Gee answers a mysterious call on Solo’s phone…

Solo secretly arranges a surprise birthday party for Gee. Pu shows up as well, and Kao tries to get closer to him through playful challenges. Gee publicly declares Solo as his partner, but is soon harassed by people from Solo’s past. Solo defends him but is taken in for questioning. Jay, whom Solo distrusts, helps get him released. A tense conversation between Solo and Jay reveals long-hidden truths.

Gee recalls his childhood at the orphanage. His childhood friend Pamuk visits, informing him that their foster mother is hospitalized. Gee rushes to the hospital to see her. Due to exams, Solo can only meet her via video call. Gee tries to transfer her to a better hospital, but it’s too late—she leaves him with meaningful final words.

Exhausted, Gee collapses but eventually visits the countryside farm where his foster mother spent her final days. There, a child named Moon asks him to be their teacher. Kao joins later, upset that Pu couldn’t come—until Pu finally arrives. That night, Pu opens up to Kao about his brother Palm and the real story behind the rumors.

Solo, Gee, and Moon enjoy a day in the forest. Later, Moon sneaks away to the hospital, prompting Solo to take him somewhere meaningful. While organizing his foster mother’s belongings, Gee finds a letter. Meanwhile, Kim, Kem, and Pet go camping. Pet tends to an injured Kem, and he and Kim have a heartfelt conversation by the lake.

Kim argues with Kem again during camp and is hospitalized. As their sibling relationship strains, teacher Perth steps in to help. Kao is heartbroken knowing Pu is leaving for England. He confides in his mother. Solo’s father, during Solo’s absence, visits Gee and demands he break up with Solo due to his position. Later, at Gee’s internship company, he and Bie face another challenge.

As Solo tries to run from reality, Gee confronts him with his true feelings. Solo returns home, and Gee continues his internship. Searching for a final presentation idea, Gee finds inspiration unexpectedly. On the day of his presentation showdown with Linda, what decision will the director make? And what fate awaits the love between Gee and Solo?