Is Song Joong-ki fluent in Italian?

No, Song Joong-ki is not fluent in Italian. He has not demonstrated any proficiency in the language, either publicly or in interviews. However, he has expressed an interest in learning Italian in the past.

In an interview with Star News in 2018, Song Joong-ki expressed interest in learning Italian and said he would like to visit Italy one day. He said he was inspired by the language and wanted to learn it. He also expressed admiration for Italian culture, saying he found it very interesting.

Song Joong-ki has not made any further comments about learning or speaking Italian, so it is unclear if he has made any progress in the language. Nevertheless, his interest in the language and culture of Italy indicate that he would be open to learning it in the future.