I'm so bored I think I want to make I Know But/Nevertheless promotion dates prediction based on the pattern of previous JTBC dramas on the same time slot (re: Beyond Evil & Undercover). It's just for fun and of course I can be wrong.

The Fri/Sat time slot is pretty much confirmed I think since it’s on the confirmation news. Unless they make a sudden change….. (well then this thread is pretty much useless lol) https://www.soompi.com/article/1459762wpp/song-kang-and-han-so-hee-confirmed-for-upcoming-romance-drama

JTBC usually puts a week gap between 2 dramas
BE first episode (Feb19) released 2 weeks after Hush ended (Feb6)
Same with UC first episode (Apr23) released 2 weeks after BE ended (Apr10)
If there's no delay, UC will end on June 12
That make IKB possible release date is on June 25