Children who live in hiding with superpowers, along with their parents who live with painful secrets of the past, face enormous dangers together.

Kwon Do-hun is an expert sniper and a secret agent working for the National Intelligence Service. To conceal his true identity, he lives a double life as a regular trading company employee, keeping even his wife Kang Yu-ra in the dark. Though he is occupied with his work, Do-hun cherishes his wife deeply. Meanwhile, Yu-ra, a dedicated homemaker, harbors a secret. Their tranquil existence is thrown into turmoil when Jo Tae-gu emerges, posing a threat to their carefully crafted façade.

A fairy tale writer Yonghee lives a soulless living after losing his wife. He has been unable to enter the room for a long time where his wife used to paint, as he has hyperventilation symptoms whenever he enters the room. One day, strange sounds are heard from the room. As he courageously opens the door, water is leaking from the ceiling. In the room, a kitten that Jane secretly has hidden has lived there. Moreover, Roan, a carpenter who comes to repair the ceiling, suggests to make this abandoned room into a cat room. What will Yonghee choose?