The Girl Outside the Window

The Girl Outside the Window, originally known in life as Da-som, is the ghost of girl student that died in the pond of Yeondu High School.

The Ghost Story[]

Main article: The Secret Of The Pond - School Ghost Stories (7)

※ It is possible When you play the Hard mode or more. In PS4/PC version, it's possible in Super Easy Mode or more. However, she will rarely appear.

Spoiler warning: Story (Plot) and/or ending details follow. Read at your own risk! (Skip section)

She doesn't exist in the original game and only exists in School Ghost Stories (7).
In the original, it appeared under the name Su-kyeong [수경] .

Her name is Da-som mentioned in document. ( the name of the characters in the story are changed )
She appears on the hallway's window near the Gym Storage Room in 2nd floor, Main Building Section 1
She appears when you look at window.
In the PC/PS4 version, you have to wait a little bit to see her.
Before she appears, you can hear the rubbing sound of the window glass with the water sprayed.

You need a Love Letter for her appearance condition.

Mobile ver : It is on the highest place of the Main Building Section 2.
PS4/PC version : It is found at the top of the north stair near the Main Office of the Main Building, Section 1.

Spoilers end here