Senior secret garden constellation _ senior secret garden constellation

In the ninth episode of The Secret Garden, Ji Rowling tells Kim the password of her home, implying that it is a constellation. When Jin Can Zhu Yuan thought of the star she said, how did she think of the password?

Oscar (OSKA) has always been the star of JK Rowling, especially in that episode, the three of them are in Jeju Island, and the three of them are in an open-air restaurant. JK Rowling tells Oscar that he is her shining star. At that time, Kim felt sick, so Kim thought that JK Rowling's star was Oscar-Oscar's birthday.