While Talay and Fahfon are trying to get used to their new life together, a random occurrence reveals Fahfon's mermaid weakness. Nannam and Fahfon's friendship hits the breaking point. Meanwhile Plangton has to adapt to his life in school with new friends and suspicious stalkers and gets into a sticky situation when his merman weakness returns. Payu continues growing closer to Khaofang and discovers an important piece of her past.