How can it be a happy ending story?? Where is the human princess? Things won't be so easy. The prince will choose a princess, not a mermaid. And where is her pursuit for the real soul? Anyway, true love conquers all.
The "Siamese Twins". He's right there but you cut yourself away and then he's there no more. The psychologically conjointed twins always share the same doom. 铁叔(¯﹃¯)