As soon as it was confirmed that Song Joong Ki is in a relationship, many fans used their detective skills to see who the actor's girlfriend was.

Many fans deduced that Song Joong Ki's girlfriend is actress Katy Louise Saunders. Although Song Joong Ki's agency neither denied nor confirmed Song Joong Ki's girlfriend's identity, netizens think she is indeed Katy Louise Saunders and shared pictures and videos of her.

Since then, many fans have noticed that Song Joong Ki had mentioned the name "Katy" back in September. Song Joong Ki attended the 'APAN Star Awards' in September of this year and was awarded the grand prize for his role in Vincenzo. In his acceptance speech, he mentioned his family and everyone he had worked with. He ended the speech with, "And my beloved Katy, Nalla, Maya, Antes. All of our friends who blessed us. I want to say, I sincerely love you." 

Many fans are loving how Song Joong Ki mentioned his girlfriend's name during his speech after his dating news broke out to the public.

Additionally, many are certain that Song Joong Ki is dating Katy Louise Saunders after she tutored him. 

According to the character's profile, Vincenzo Cassano graduated from Bocconi University in Italy, which is, in fact, Katy Louise Saunders's alma mater. According to some media outlets, Song Joong Ki and Katy Louise Saunders got to know each other when Song Joong Ki took Italian lessons from the former actress, preparing for his role in 'Vincenzo.'