Wooseo Shin was never one to believe in fate... until a ring of red thread appears around his finger, that is! This ring marks a person's meeting of their soulmate, and with it, neither can fall asleep if the other is absent. This development is not a welcome one for Wooseo, who decides to keep it from his close friend and crush Jiseok Kang at all costs. Because as fate would have it, the person with Wooseo's matching set is Jigeon Kang-Jiseok's older brother! When Jigeon proposes that they start sharing a bed, if only to combat their joint insomnia, Wooseo reluctantly accepts... but as the two spend more and more time together, feelings start to get messy. Will Wooseo be able to survive his new life tangled up in between these two brothers?!