He is an abandoned child and is not needed. He does not remember every detail of his mother. He only knows the biting coldness of the river. That dream he has had for 16 years. The feeling of drowning when he wakes up is the most familiar. The wound will scab, but it does not mean that it will not hurt.
Concept: Everyone has a knife in their hand, but some people point it at themselves, and some people point it at others.