The chemistry between actors Lee Seo Jin and Choi JI Woo was obvious when the two appeared on the variety show "Grandpas Over Flowers." And their appealing chemistry set off dating rumors that persist almost a year later.

On February 4, an article in the media outlet Korea Times reported that Choi was still being asked if she was dating Lee. She denied it but in a vague way.

Choi said that after the program people encouraged her to date Lee, but appearing on a program together does not automatically mean you should date.

'Does co-stars mean dating partners after all," she said.

Not necessarily, but it was apparent that they liked each other..

The actors worked together on the 2015 episode of the program that also starred four actors in their seventies, Lee Soon Jae, Shin Goo, Baek Il Seob and Park Geun Hyung. Lee and Choi accompanied them on a backpacking trip.

It was quickly obvious that Choi and Lee were fond of each other. She called him "cute." He said she did not need to wear make-up.

In May, the program's producer/director Na Young Suk, asked if they were dating and planned to marry. Lee said they could marry if Choi fixed her excessive spending habits. She said, no thank you, and then everyone laughed.

In July they also both starred on episodes of the variety program "Three Meals a Day." He ate some kimchi she made the week before. He commented on how good it was and asked if she would be on the show that day.

Producer Na Young Suk teased him by saying, "Bring her here every day. Just get married then."

And so the shipping continued.

Choi Ji Woo recently appeared in the drama "Twenty Again" as a 40-year-old woman who goes back to college. She can also be seen in the film "Like for Likes," a movie about people who find romance online.

Choi plays a stewardess who rents a room to the character played by Kim Joo Hyuk.

Lee's variety show appearances have kept him busy during the past few years. He also appeared on "Running Man" last year. His last drama was "Wonderful Days" in 2014 and in 2015 he appeared in the film "Love Forecast" with Lee Seung Gi and Moon Chae Won.

Lee Seo Jin dated actress Kim Jung Eun for two years and Choi publicly dated fellow actor Lee Jin Wook for two years.

What do you think of this couple?