She didn't talk much and was really shy.
It might be because she was in an accident when she was young.
An accident?
When she was in first grade, her family went to a river
but there was an accident there.
Yoo Sun fell into the water, and her father died trying to save her.
Oh... so that's why she painted a picture of a river.
When Yoo Sun was young, water-related accident occurred; father passed away.{i}