Gene es un escritor profesional, que un día recibe la solicitud de su editor para probar suerte en el género BL (Boys Love). Él acepta este nuevo desafío, escribe y publica una novela. Esta es bien recibida y se vuelve increíblemente exitosa; tan exitoso que incluso se planea una serie live action. Gene, entonces es engañado por Nubsib, un chico de 18 años, que llega a la audición para el papel principal, fingiendo ser educado y bondadoso cuando en realidad es un lobo completamente.

Gene agrees to let Nubsib live with him for a month as a favor to Tum. During this time, Nubsib and Gene fall into a routine of sharing meals together and even begin to practice Nubsib's lines in the series he is filming.

Those who know Gene and Nubsib begin to take notice of their growing connection, including some fans online. Gene is kept occupied by pressure to complete his next novel as well as his upcoming reunion with his old classmates.

Gene attends a reunion with old classmates where he gets drunk and requires Nubsib to bring him home. As the one month deadline approaches, Gene reminds Tum of his requirement to find Nubsib a new place to live.

Aey approaches Gene for advice on how he can express his feelings for Nubsib. Aey's birthday leads to an uncomfortable family gathering.

Gene travels back home to visit with his family where he makes a surprising realization about his relationship with Nubsib.

Nubsib and Gene meet as children due to living in neighboring homes. Gene is a rare source of fondness towards Nubsib, who quickly becomes attached to his friend.

Gene recommends that he and Nubsib take a fresh start in their relationship by not living together. Later at the Bad Engineer Series promotional event, Aey grows frustrated with Gene and the attention his relationship with Nubsib is getting.

Gene is lured to a bar to meet Aey who promises that he has something important to discuss. Auntie Orn invites Gene and Nubsib home for a joint family dinner.

Gene and Nubsib work to find understanding amongst their families. A photoshoot requires a trip to the beach for Nubsib who insists Gene comes along.

Nubsib, Gene, and Aey attend a press conference to address the rumors about SibGene. Nubsib and Gene approach the end of the remaining four months of the contract with the production studio.