Next door. Younger guy. Heart fluttering. summary: Ji-on Lee, a 9-year veteran accountant who proudly lives by a no-marriage policy, decides to take an extended break after being worn out by work. But during her much-needed rest, she crosses paths with a mysterious younger man who just moved in next door. Though seemingly innocent, his bold and provocative advances begin to shake her resolve… Can she stick to her solo life, or will her heart take an unexpected turn?