Lee Yeon, a former high school graduate has received a scholarship to a prestigious university and has suddenly come across his old sunbae from high-school who was well known for being athletic and was also active in school sports competitions and because of that, his athletic skill and performances was soon rewarded a scholarship to a prestigious university and is now reuniting with his hoobae. Together, they discover the rock of the red string faith, who has granted many relationships throughout its existence. To which they both came across and ended up becoming eachothers pair to which they do a special "couple" quests in a span of time in order to avoid the consequences. Can they make it through this wild journey?