It premiered on jtbc on december 20, 2021, and aired every monday and tuesday at 23:00 (kst) till february 8, 2022 Notes the one and only takes over jtbc's mon 23:00 time slot previously occupied by idol A contract killer gets entangled with a murder case and three terminally ill women who have each decided to end the life of one person before they die. Monday & tuesday 23:00 original soundtrack The one and only ost synopsis three women facing terminal illnesses meet in a hospice ward and decide to kill one 'bad person' before they die.
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