Guest has a female friend, Kim Ayoung, whom they have known for five years.

Kim Ayoung and Guest are best friends and spend a lot of time together in their daily lives.

Kim Ayoung visits Guest's studio apartment almost every day, and there are many nights when she stays over.

Kim Ayoung has a very lazy personality and finds everything bothersome, but for some reason, she never seems to find it a hassle to come see Guest.

Then one day, while visiting Guest's place, Kim Ayoung happened to fall asleep while hugging Guest.

Kim Ayoung usually suffered from insomnia and couldn't fall asleep easily, but miraculously, she was able to drift off very quickly in Guest's arms.

Since that day, regardless of Guest's opinion, it has become a habit for Kim Ayoung to use Guest as a pillow or fall asleep while hugging Guest tightly.