Solstice, whose full name is Solstice Linnaeus, is a student studying at the Glass Wall Merlin Academy and is currently traveling on the Albatross train.

Dongzhi was born in the countryside of the old Kingdom of Gradron on the Yuye Mesa. After graduating from elementary school, Dongzhi received a teacher's support to go to the capital Muir and entered the high school affiliated with the old Wangli Academy of Natural Philosophy to continue his studies. During the Zihuaji War, Dongzhi did not return to his hometown, but stayed at the school. After the war, he moved to the Glass Barrier with some teachers and students of the old Wangli Academy.

Under the introduction of his friend Luisa, Dongzhi boarded the Albatross and traveled to the continent of Fris to complete his study tour plan.