• Kim Go-Eun and Gong Yoo star in the tvN drama 'Goblin.'

Kim Go-Eun and Gong Yoo star in the tvN drama 'Goblin.' (Photo : YouTube/tvN DRAMA)

"Goblin" co-stars Gong Yoo and Kim Go Eun have developed such a close friendship on the set of the hit tvN drama. Some of their biggest fans believe that two have also started falling in love with each other.

According to Soompi, Gong Yoo and Kim Go Eun recently practiced their script and blocking for the upcoming filming of "Goblin." Throughout the entire time, the co-stars have been making fun of each other and laughing nonstop.

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Even though most of the scenes they were practicing were supposed to be sad and emotional, the two actors could not help but laugh because they were so comfortable with each other.

At one point, Gong Yoo surprised Kim Go Eun by saying some of his lines in his own dialect. The latter cracked up and came up with her on antic. While practicing on set, Kim Go Eun suddenly took Gong Yoo's photo when this is not part of the scene.

But to make sure that he will not be stealing the moment away from Kim Go Eun, Gong Yoo kept asking all of the staff on set if they also think his co-star is very pretty.

The video of the co-stars were posted online on Soompi, and you can watch it here.

Meanwhile, "Goblin" aired its final episode on Saturday, Jan. 21 and as expected, it generated high ratings from fans. But before the episode was released, the cast and staff had to go through three straight days of filming to make sure that their story and effect would be engaging for the viewers.

On Sunday, Jan. 22, the cast of "Goblin" reunited for a special thanksgiving party for the success of the film. Even though some of its episodes did not rate as high as "Legend of the Blue Sea," the entire team is still grateful to be part of such a wonderful project.

Next month, the entire cast and crew of "Goblin" will head to Thailand for their well-deserved vacation. Next month, special episode of the K-drama series will also be released.