'Lee Seon' dreamed of becoming a wise mother and wife, leaving her unfortunate past behind. But there was no proper man in this world! Thinking that starting over was the only way out, she dreams of a new love by faking suicide. Absurdly, 'Lee Seon' faced a real death! The moment your breath stops, the seven-day time slip door opens to look back on past relationships... Will her love be rewarded?

One year after a chance encounter at a shoe store, 24-year-old Ji-hoo and 28-year-old Tae-soo meet again as colleagues in the same company.