It turns out that "haunting" is an adjective.
Yu Nian has been with Shen Du for twenty years, from an illegitimate child in the mud to a boss who covers the sky with one hand. However, Shen Du could not let go of Bai Yueguang, who died young, and even married a substitute.
Yu Nian was sent to an extremely dangerous situation. After he was shot and fell to the ground, when he woke up, his soul returned to Shen Du.
This time, she still followed like a shadow, watching the truth peel off layer by layer.
But Shen Du could not see her the whole time.
It turns out that this is what "an unexpected combination of circumstances" means.
