"The Time We Were Not in Love" is a South Korean romantic comedy-drama series about a friendship that turns into love. Oh Ha-na and Choi Won have been inseparable for over 20 years. Their relationship resembles a constant competition filled with teasing and playful tricks. One day, they decide to bet on who will get married first. The one who manages to walk down the aisle before turning 35 will receive a substantial sum of money. Now, the friends try to sabotage each other's romantic plans, gradually getting too caught up in this game.