IU and Park Bo Gum have captured viewers' attention with their sparkling chemistry in the new drama 'When Life Gives You Tangerines.' Set in the 1960s on Jeju Island, the show follows the story of aspiring poet Ae-sun (played by IU) and Gwan-sik (played by Park Bo Gum), a faithful friend who has always been by Ae-sun's side.

While 'When Life Gives You Tangerines' has become a hot topic lately, fans have also uncovered proof of the long-lasting friendship between IU and Park Bo Gum. A recent viral post compared the two in a modern-day photoshoot to a photo of a commercial they did together in 2012. 

IU and Park Bo Gum also revealed more about their 13-year long friendship in a recent interview with Teen Vogue. IU began by explaining that one of the main reasons she had decided to star in 'When Life Gives You Tangerines' was because Park Bo Gum would be her costar. She also revealed her initial reaction when she found out who he would be playing: "From what I remember when I first heard that Bo-gum was cast for the role of Gwan-sik, the first thing that came out of my mouth was, 'Is it okay for him to be that good-looking? Is it okay for the character Gwan-sik to look like that?' Because if he were that good-looking, I'm sure everybody that knew him on the island would probably have a huge crush on him and I don't think he's going to be able to stay on the island."

Park Bo Gum joined in, saying, "For me as well, when I heard about the casting, she is someone both as an actor and an artist that I have wanted to work together with for a very long time."

He went on to reveal the history of the friendship between the two stars: "When we were in our teens, we first met to do a commercial together. Then in our 20s actually, I made a special appearance in the series The Producers, so we got to meet briefly back then. Now after we were both in our 30s, we finally got to work on the same project. Especially because we're both the same age as well, I think we had great chemistry. We were very much at ease with one another. I almost wish that the amount of time we spent together was longer. Especially now that the time has passed, [when] I look back on it, I just think that we had such a fun time on set and I hope that we get to work together again."

SEE ALSO: IU shares more behind-the-scenes cuts from 'When Life Gives You Tangerines' Part 2