Seo Ji Seong is a programmer on the A.I. Development Team at Smart Home Appliances. While working on a refrigerator, she accidentally inserts a chip belonging to the National Intelligence Service. Instead of a program that will rate the freshness of vegetables, it will root out the undesirables from a dating pool, potentially saving people heartache. Seo Ji Seong herself wants to fall in love, but with the right man. Despair sets in when her program determines that her oh-so-perfect fiancé, Jeong Han, is not her Prince Charming after all! She meets firefighter Jung Gook Hee, who has no social media presence. This leaves Ji Seong without a shred of data for her program to analyze. She can't help but be skeptical, not knowing a thing about Gook Hee 's past. Should Ji Seong take a leap of faith with him, even if it could mean another heartbreak for her?