Lan Zhan (age 6) plays in the shallows, but a sudden big wave...

His father, talking with his friends and drinking, doesn't notice at first, but Lan Huan (age 8) raises alarm.
It feels like a miracle when they find Lan Zhan on a solitary rock protruding from the sea, alive, and just dehydrated.
Madam Lan divorces her husband and takes her sons away.
He travels the world, but his most ardent wish is to find the mermaid family that helped him...
LWJ: has found his special interest, asks for a deep sea diving course as a gift for his 15th birthday
Cangse Sanren, exasperated: You save one human guppy and suddenly you have to deal with *gestures to Merxian's doll heads collection*
(Look, dolls often have big shiny eyes, and they remind him of his little friend!)