South Korean actor Song Joong Ki and his wife, Katy Louise Saunders, recently welcomed their firstborn, and the baby boy is already causing a stir on the internet for an unusual reason.

The star of "Vincenzo" shared the joyous news of his son's birth in a heartfelt letter posted on his fancafe on June 14. The actor expressed his elation and gratitude at being a new father in Rome, Italy, the hometown of his wife.

In his message, Song Joong Ki said, "I'm in Italy right now. I finally met my baby here in Rome, my wife's hometown. He's a healthy son. Both the baby and his mother are very healthy, so I'm taking care of my family happily with gratitude."

He described the arrival of their son as "the most precious gift" for the couple, whose biggest dream was to build a joyful family together. The actor also expressed his appreciation for the support they received, attributing the joy of this day to the well-wishes from many.

The actor then shared a personal photograph of him and his newborn son, which instantly became an internet sensation. Intriguingly, it's not just the baby's lineage to the famous actor that is driving netizens to frenzy, but a peculiar detail-his impressively long and "handsome" fingernails.

Online communities were abuzz with comments on the baby's strikingly long nails, with several claiming that the feature is a sign of the baby's future height and good looks.

Netizens commented: "I can tell he is handsome by just looking at his fingernails," and "The baby's fingernails are long for a newborn. He's going to be tall." Other reactions included: "Wow, the baby's fingernails look like an adult's," and "His fingernail is already handsome."

While the internet continues to swoon over the newborn's unique trait, the proud parents are likely more focused on his health and happiness. Song Joong Ki and Katy Louise Saunders tied the knot officially in January this year. As they embark on their parenting journey, the couple can look forward to more such interesting observations and discussions sparked by their son.