I, the Mermaid, am the Siren Tribe's Beloved

(Translated by me, IcedMatcha_yasha)

我，人鱼，鲛族团宠
Author: 二月初九

Tang Li is a little mermaid with a damaged tail.
While other mermaids have shiny golden tails, Tang Li's is warm orange and he has never been able to transform into legs.

Suddenly one day, something called the System tells him - he's a little mermaid with a Koi Carp buff, able to bring good luck to those around him.
As long as he obediently completes system missions - bringing good luck to the strategy objects in each world - he can save up lucky coins to exchange for the props to transform into legs from the mall.
In order to transform into legs and set foot on the continent he has long yearned for, Tang Li starts laboriously heading to each world to complete tasks.
Finally, hard work pays off for the determined fish, and in the last world, as a soon-to-be-born hatchling, Tang Li sits in the egg, counting on his fingers -
(〃'ω'〃) Soon, he'll be able to save enough props to transform into legs!
The eggshell cracks open, and a little light and damp seawater gradually envelop Tang Li. A group of "ferocious" "mermaids" appears before his eyes.
System: "Oops, darling, you've crossed into the wrong world. The mermaids here are extinct; only Sirens remain."
Tang Li: QAQ?
System: "Your strategy object... is none other than the Siren Crown Prince who seems the most unapproachable, T▽T"
The siren Crown Prince Shen Yaochuan has a cold and reclusive personality, the star system's only SSS-level output-type mental power despite his young age, he was injured in war, leaving him disabled and with severe mental damage, causing everyone to keep their distance.
Meanwhile, a still unhatched mermaid hatchling struggles to swim up to him, dragging himself and his eggshell together to present to him.
.....