Dugeundugeun Daejakjeon

Nam Do-yeon and Jeong A-rin have been inseparable since the sandbox days of elementary school, their bond weathering every awkward growth spurt and late-night study session all the way through the final bell of high school. What began as a natural friendship gently matured into something deeper, making them the picture-perfect couple—the kind that finishes each other's sentences and never raises their voices in an argument. But somewhere between the comfort of routine and the safety of mutual understanding, a quiet dissatisfaction began to settle over their otherwise enviable romance. For a pair so committed to navigating love with logic and level-headed precision, the absence of a certain spark has become an undeniable variable in their equation. They have the stability, the trust, and the shared history—yet that exhilarating rush, the breathless thrill that stories promise, remains stubbornly out of reach. Refusing to accept mediocrity in matters of the heart, the two decide to tackle the problem with their signature systematic approach. Their solution? A meticulously crafted, slightly absurd, and wholly endearing campaign of deliberate chaos designed to jolt their relationship back to life—Operation: Heartbeat. As they set their carefully calculated plan into motion, they soon discover that manufacturing butterflies is far messier, more unpredictable, and infinitely more complicated than any spreadsheet could have predicted.