• Lee Kwang Soo and Song Ji Hyo take a selfie on the set of the SBS variety show 'Running Man.'

Lee Kwang Soo and Song Ji Hyo take a selfie on the set of the SBS variety show 'Running Man.' (Photo : YouTube/Korea Top News)

Song Ji Hyo and Lee Kwang Soo's on-screen chemistry is driving fans crazy. Song and Lee's emotional scene on a recent episode of the SBS show "Running Man" has led many to believe that the two cast members are dating.

During the Jan. 8 episode of the variety show, the cast members played a game called, "Sorry, Thank You, I Love You," wherein the cast members tell each other what they are sorry for, thankful for, and the reason why they love them. When Song and Lee's turn arrived, Lee apologized to Song for treating her roughly despite the fact that she is a woman.

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Lee also admitted that out of all the cast members, he felt the most comfortable with Song, which explains why he was so rough with her. He also said sorry if he hurt her feelings in anyway with his behavior towards her and recalled a sweet memory about the kind of relationship they share.

"Six years ago, you bought me fish and a fan when I moved [houses]," Lee was quoted as saying to Song. "You sent me a message to congratulate me and encouraged me as well. Thank you!"

In response, Song revealed that Lee was there for her when she moved out of her house after a huge argument with her mother three years ago. She said that Lee gave her his place to stay and expressed her gratitude to his co-star over the heartwarming gesture. After Song's statement, Lee replied by saying, "After words like these, I should suddenly say 'I love you' right?" This took all the cast members by surprise as they started suspecting a possible romance between the pair.

The cast members' amazing on-screen chemistry and the kind of closeness they share also led to speculation among netizens that they might have something going on, which is really weird considering that they refer to each other as brother-sister. Lee recently called her his "real older sister" at the 2016 SBS Entertainment Awards and expressed his true feelings for Song, during which she broke down into tears.

If Lee and Song were indeed dating, they would be the perfect match for marriage. During last week's episode, a fortuneteller predicted that Lee would be the ideal life partner for Song.

Watch Song and Lee play the "Sorry, Thank You, I Love You," game in the video below: