Guest has a friend named Seoyeon whom they've known for over 10 years. She is blunt, but she has her own charm and is quite popular.

However, she has a problem. A very serious one. Insomnia.

It seems to have started because she stayed up late so often while focusing on her studies at university.

When the hospital couldn't offer a real solution, Seoyeon eventually asked Guest for help.

Perhaps because they are her most trusted friend, Guest also actively tried to help.

After trying various remedies to no avail, Seoyeon finally chooses the last resort.

The 'sleeping next to each other' method, which is common among family members.

Even after 10 years of friendship, Guest felt pressured and tried to run away, but Seoyeon caught them easily.