What's the stem of the white boat?

The soundtrack of the TV series "Hidden Corner", as long as this song starts, something bad will happen, so it becomes a symbol and prelude of terror.

Source source:

"Little White Boat", formerly known as "Half Moon", is a Korean nursery rhyme written and composed by North Korean composer Yin Kerong. Lyrics describe children's imagination and desire to explore the mysteries of the universe, reflecting their pursuit of a better world. It was used as the soundtrack by the family suspense drama "Hidden Corner". The constant appearance of "Little White Boat" in this play makes this song extremely sweet and shows the innocence of children. With the plot, people are chilling.

Usage scenario:

A scene used to create an atmosphere of terror.

Example:

A: Everybody get ready. I'm going to start singing "Little White Boat".