"Vincenzo" lead actor Song Joong Ki successfully finished his free online live event last May 7.

And what made it more entertaining was Kim Sung Cheol's surprise appearance.

Here are some of their cute interactions!

Kim Sung Cheol was Song Joong Ki's Surprise Guest in His YouTube Live Event

After wrapping up "Vincenzo," Song Joong Ki met with his fans online to virtually thank them, his beloved Ki Ailes (Song Joong Ki's fan club).

While enjoying his first online fanmeeting with MC Jaejae, Song Joong Ki was surprised to see his real-life friend, Kim Sung Cheol, as his guest.

The two were shy at first, not until the "Descendants of the Sun" star saw the phone of his special guest showing automated greeting messages on the screen, a scene familiar to the theme and "Vincenzo" fans.

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As the duo showcased their chemistry, MC Jaejae was also fangirling on the side over the two actors in front of him. She also teased them about their short but entertaining bromance in "Vincenzo," saying they could win the Best Couple Award for 2021.

Song Joong Ki then laughed, saying it will not happen, and with Kim Sung Cheol sharing he didn't expect their short drama interaction would get lots of attention and overwhelming response from fans.

Song Joong Ki Recommended Kim Sung Cheol to Play the Character of Hwang Min Seong

As they continued sharing their stories, Kim Sung Cheol couldn't stop laughing when he confessed that during the day of the shoot, he was wearing tight white pants, and Song Joong Ki revealed he wanted to go home the moment he saw it.

In response, Song Joong Ki shared, "He is like a younger brother to me (dongseng), we are close to each other since we have been working on various projects already. But during our shoot, we both felt uncomfortable, still we had lots of fun. Kim Sung Cheol did interesting ad libs, which made the set livelier."

The "Space Sweepers" actor also confessed he directly recommended Kim Sung Cheol for the role of Hwang Min Seong because he has been close to him for a long time.

And after recommending him to director Kim Hee Won, she clapped and said herself Kim Sung Cheol was the perfect actor for the role.

The "Do You Like Brahms" star said, "Song Joong Ki told me to have a cameo in 'Vincenzo,' and when I got the script, I was surprised to see Tae Ho and that was when I realized that this would be a fun work. [That] I want to do it."

He added, "Hwang Min Seong is a bad boy but he loves Vincenzo so much. And I also love Song Joong Ki so I said I would do it."

Song Joong Ki and Kim Sung Cheol, to fans' delight, reenacted their Tae Ho and Hwang Min Seong moments in "Vincenzo," which made the viewers feel their adrenaline rushing through their veins!

Watch the complete footage of Song Joong Ki's online fan meeting here!

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What can you say about Song Joong Ki and Kim Sung Cheol's cute interaction at the fan meeting? Don't forget to share your thoughts with us in the comments!

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Written by Shai Collins