In 2011, a stubborn teacher Ann was transferred by her director to the houseboat school in a remote area as a punishment of her refusal to erase her tattoos.

Ann had to teach a group of young students who lived around the dam area, and the houseboat had no access to both water and electricity.

One day, a bloated corpse of tourist was found beneath the toilet area of the houseboat, scaring all children and Gigi.

Ann was also proved to be a talented teacher who used friendly competition and rewarding system to motivate her students, in contrast to traditional tutelage.

Chon, a sixth grade student, struggled with basic algebra and expressed his desire to just be a fisherman like his family.

A student found a picture that Gigi took one year ago and recalled Ann’s star tattoos on her arm.

Ann was teaching her class about buoyancy force using a swimming pool, angering a senior teacher who accused her of endangering students for the sake of physics.

Feeling guilty, Song resigned from the houseboat school to pursue advanced education, although he was relieved knowing that Ann would soon return.

A lovestruck Ann is excited to learn that Song, who is still helping the houseboat to get electricity and other appliances, will visit the students soon.

She reads her last entry, where she writes to thank Song about her return and how he has influenced his students, reminding Ann of what it is to be a teacher.

Ann finally decides to let Nui go and go back to the houseboat school, where she finds Song fixing a power generator.