When an astronaut leaves Earth for Mars, the vast infinite space divides star-crossed lovers in this animated romance that crosses the cosmos.

Life in the countryside is quiet and mundane for bookish Yi-gyeong until an errant ball sends star athlete Su-yi crashing into her life. The connection between the two girls is instantaneous, and simmers until their mutual attraction bubbles up into love.

National track star Na Aeri, and her eternal rival 'Hany' join, the two participate in a special event race called 'Street Run' through the city's alleys, where they face off against the rising comet-like newcomer 'Rapid Ju'.