Synopsis: 19-year-old Merperson Yang Luo Tian was always a boy until he met Lee Heng Yu. When Luo Tian first falls in love with Lee Heng Yu, his body begins to change gender. Luo Tian realizes that he is slowly turning into a woman, and, in order to avoid undue attention to sudden changes, he moves to another college. But soon she finds out that Heng Yu turns out to be her roommate. Living with him under the same roof, Luo Tian tries to hide his transformation, besides, the newly made girl has other secrets … Also known as:人鱼恋爱法则 Also known as:人鱼恋爱法则 Watch drama online for free.