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Guy (Jespipat Tilapornputt) is a man on a mission. Every week, he receives the names of a couple through an application called 'Best Times'. Guy's duty is to ensure this couple spends their time together in the most meaningful way possible before one of them passes away within the next seven days. Every time Guy appears, he is accompanied by a light mist and a sudden, freezing chill. Guy possesses special powers to aid in his mission, but the one thing he cannot do is reveal the truth about who is destined to die.
Toey (Nuengthida Sophon) and Arm (Asadayapanichkul) are a young married couple who used to be deeply in love. However, over time, they neglected each other and unknowingly drifted apart. Toey, the owner of a cooking school, is obsessed with teaching and creating new recipes. Meanwhile, Arm, an application designer, is entirely focused on creating an app called 'Next to You', which he believes will be a massive business success.
Toey begins to suspect that Arm has another woman in his life because he even forgot her birthday. Furthermore, she discovers that Arm seems to be more than just friends with a woman named Prae (Sarucha Phetrojan), who has started appearing in their lives frequently. Fortunately, Guy enters Toey's life at just the right moment. Although Toey does not remember him, she is happy when Guy says he is her high school friend. Guy begins to appear and play a larger role in Toey's daily life, causing her to wonder who he really is and why he seems so urgently trying to get her to reconcile with Arm.
When Toey suffers an unexpected accident and a fortune teller warns her that her fate is broken, she discovers a truth about her life that is about to change. Yet, she is unable to tell Arm, the man she once loved with all her heart. What is the secret Toey cannot tell Arm? Why is Arm dedicating everything he has to create the small application called 'Next to You'? Is Prae the woman who will replace Toey in Arm's life? And most importantly, can Guy successfully complete his mission without telling either Toey or Arm who is the one destined to die?