Yoo Mi is the woman who tells a small lie and ends up living someone else’s life. Hyun Joo is a woman who lives her life holding herself above everyone, treating them with neither kindness nor malice. She has a subtly tense relationship with Yoo Mi. Ji Hoon is Yoo Mi’s husband who is ambitious and future-oriented. Ji Won is a dependable senior who is the only person whom Yoo Mi trusts.

In a world where an app alerts people if someone in the vicinity likes them, Kim Jojo experiences young love while coping with personal adversities.

Choi Su Jung, a 16-year-old high school student, is brutally murdered by a serial killer. Her friend Young Jin gets to take a phone call from the killer and says that she’ll find and kill him. Over two decades later, Young Jin has become a police officer and still desperately tries to find the serial killer. She has a young, middle-school-student neighbor Eun Ho. He gets shocked by what’s inside Young Jin’s room when he comes over to her place.