Do you love summer mandarins?

In a world of advanced technological progress, all students are surrounded by the metaverse, constantly living online. They have virtual reality glasses, and online they communicate through avatars. In the new year, Son Hyuk enrolls in a high school near his home. The same one his late older brother, Jin, attended. The young man has few memories of him, but everyone keeps repeating about their resemblance. One day, the young man learns about an old game called "Gaudi," where you need to build houses. In it, he discovers with surprise an old account belonging to Jin and logs into it. The brother's house and garden have been preserved thanks to a user with the nickname BlackPine, who took care of them. After their fateful meeting, Son wants to learn more about his brother through shared memories with the girl who understood him better than anyone else.