The second season if happens will most probably will be based on Kang Full's other works which are itself connected…
i'm not really informed about scripters, directors etc... so i don't have an opinion about this. What i can say is that everything about this drama told me that there will be a s2
they can't be not producing season 2 (is it correct?), i mean they use 2/3 of the entire drama on flashback, the present was "located" in 2019, they gave us some teaser for a new season, it had good ratings there is no reason not to, apart from the actors wages.
this whole show summerized: bla bla bla, romantic scene and song, bla bla bla, romantic scene and song X3 - oh no my sister is a bad person, bla bla bla, romantic scene and song.
or wife dies
or she betrays him
happy to be wrong