Jiang Wan, as his name suggests, he is always one step behind in everything he does.
It was a step too late to meet Lu Yan, and a step too late to fall in love with him. Later, when his father became seriously ill, Jiang Wan was still a step too late.
Later Jiang Wan disappeared and no one knew where he was.
Lu Yan later realized that when he first felt something was wrong, he didn't take it to heart. Later, he always felt absent-minded and realized that something was missing.
By the time he was discovered, Jiang Wan had already disappeared.
Intention: