Tomorrow with You (2017)

Yoo So Joon is the successful CEO of a real estate company who has the ability to time travel when he takes the subway. Going back and forth in time, he sees his future self living a life of torment and unhappiness. To try to offset his doomed future, he decides to marry Song Ma Rin, a cheery photographer, even though he does not love her. Can Ma Rin help So Joon change his unhappy future

If you like the time-travelling aspect of Sisyphus, Tomorrow With You has this element. That's it. Tomorrow With You is more romance, while Sisyphus has a bit of it.

Both have actresses female leads having issues with fame and its problems. They both are airheads while the MLs are more calculists

-Both dramas portray a more realistic representation of what romantic relationships are. Viewers are kept on their toes and as the couples experience many ups and downs.
-Both dramas are uniquely written and will satisfy those looking to stray away from a more ‘typical’ type of drama.
-Both dramas are slightly controversial in that not everybody will love them.
-Both have a pretty modern interpretation of romance.

based on concept married first love second.also it have great story .not rick guy but slice of life at there

Both dramas are about time travel and saving their loved ones. While Tomorrow with You is centered around the romance between the ML and FL, Kairos revolves around the mystery of the people around it.

both have ;
time travel
changing the future by changing the past
a lovely female lead that gives a certain charm to the drama

A sci-fi romance where the ML is a time traveler and has seen his future which is definitely not nice. He tries all ways to avoid and change the future, one of those includes marrying the FL. The chemistry was awesome, it's similar in the sense that he time travels to first save himself but later for something else. Amazing and matured romance, might even make you cry.

Time travel and romance in both dramas! However, the lead in Nine uses time travel more purposefully to uncover secrets in the past which sometimes makes huge riffles and changes to his present, while Tomorrow seems to be more about traveling to the future and trying to affect it by changing the present. Nine has also a more serious/darker undertone to it.

Both star Shin Min Ah, and involve a spontaneous/quick marriage at nearly the beginning of the show.

The scene that appears at the beginning of the series is similar. Those trying to convey the drama look alike. Even if they are of different types. But also different lives and choices, and the events that result from them are very similar.