Ruler of the Ancient Seas - Episode 1

During a merfolk ceremony where eggs are ranked by color from gold (highest) to black (lowest), Princess Serena's golden egg suddenly turns black, provoking her husband Kaelen's accusations of infidelity. Serena's sister, Lina, then reveals she produced a golden egg and confesses she swapped their eggs. She further admits to having a long-term affair with Kaelen. As Serena faces betrayal, Kaelen orders her thrown into the endless abyss. However, Serena survives and emerges at a selection ceremony, vowing revenge and a bloody reckoning with those who wronged her.