Cover Photo: Hyekyo Song/Instagram

Here is all you need to know about the special friendship shared between two of South Korea's biggest stars

South Korean actress Song Hye-kyo has always been private about her personal relationships, even more so after her divorce from Song Joong-ki in 2019. However, the Descendants Of The Sun actress took to Instagram this week to share a rare photo of herself with her long-time bestie, Yoo Ah-in.

Related: 5 Ways Han So-Hee’s Style Has Evolved in Her Korean Dramas

In the black and white photo, Song was seen holding her dog with Yoo next to her, trying to pet the pup. The two were smiling and clearly having a great time. 

Song captioned the picture as: "The cool Yoo Ah-in."

This is believed to be the first time she has shared a picture of herself with a man on Instagram since October 2016.

That said, despite keeping it quiet on social media, Yoo and Song's friendship goes way back. Keep reading to find out everything we know about the BFFs. 

Related: ‘The Devil Judge’: 3 Things to Know About the New Korean Drama Starring Ji Sung

1 / 4

The pair are under the same management agency

Just how close are these two buddies? Song and Yoo are not just good friends but also share the same management agency.

This fact has been something that fans have always been excited about as they patiently wait and hope for the pair to get a chance to act together again.

Related: 9 Highest-Paid K-Drama Stars: Kim Soo-Hyun, Hyun Bin, Song Hye-Kyo and More

2 / 4

Yoo made a cameo in 'Descendants Of The Sun'

That's right. Keen-eyed viewers would have noticed that Yoo actually had a small role in the well-loved drama which aired in 2016. He appears in episode 13 and it is reported that he did so as a birthday present to Song. 

In an interview at the Asian Film Awards, Yoo said, “I wasn’t able to give her a present at the party. I wanted to prepare a secret present for her and I got the opportunity to make a cameo appearance in her drama.”

Yoo also received international critical acclaim for his role as Lee Jong-su in Burning, a 2018 mystery drama, later on.

Related: Song Joong-ki Movies and Shows to Watch in 2021: Vincenzo, Descendants of the Sun and More

3 / 4

The pair have seen each other through it all

Despite their five-year age gap, Song and Yoo have managed to stay friends for a very long time. They have seen each other through the various ups and downs of their respective careers and personal lives, which, for Song, included a wedding and a divorce. 

In fact, at one point, fans suspected that the two were dating. Of course, Song put those rumours to bed when she said that Yoo was more like a younger brother to her. 

4 / 4

Yoo is close friends with Song Joong-ki

Despite the breakdown of Song's marriage, Yoo has also remained good friends with Song Joong-ki.  

Yoo and Song Joong-ki also acted together in the 2010 historical drama, Sungkyunkwan Scandal. Yoo even delivered a speech for the heavily reported Song-Song wedding in 2017.

Related: BTS, Song Hye-kyo and IU: 9 Korean Stars And Their Expensive Properties