A lonely girl in a small town accidentally drops her phone, leading to a mysterious new contact she can't erase. When she's called back to the city to visit her sick best friend, she's hesitant due to the bad memories and the presence of her abusive mother. However, she decides to face her fears for the sake of her friend who had always protected her during difficult times.

Upon her return, she discovers her friend has attempted su*cide and is suffering from depression, refusing to communicate. Suspecting bullying, she rents a place to live and enrolls in her friend’s school to uncover the truth and help her heal. As life grows more stressful, she confides in the mysterious contact, who, despite being curt and boring, offers valuable advice on being strategic and brave to achieve her goals.

As their connection deepens, the phone activates new functions, enabling them to exchange gifts, sometimes accidentally. Daily communication fosters admiration, and she begins to develop feelings for him. Though initially too cold and suspicious to reciprocate, he refrains from rejecting her, driven by a desire to uncover the secret behind their mysterious connection, which he believes to be part of an enemy plot to kill him.

After a series of inexplicable accidents, encounters with metaphysical masters, and the theft of her phone, they lose contact for a while. Upon regaining it, she realizes how little she knows about him and that she has always been the one to initiate contact. Offering to remain friends if he doesn’t share her feelings, she’s surprised when he admits he has grown fond of her and their conversations, which have become the most relaxing part of his days.

As a real couple, they support each other as he navigates political schemes and she delves deeper into the metaphysical world to protect herself and find a way to meet him in person, despite living in different worlds. Together, they face their challenges, building a unique and heartwarming relationship.